DOCUMENT RESUME ED 039 002 the Displays of a Thesaurus. Rand

DOCUMENT RESUME

ED 039 002 LI 001 929

AUTHOR Surace, Cecily J. TITLE The Displays of a Thesaurus. INSTITUTION Rand Corp., Santa Monica, Calif. REPORT NO P-4331 PUB DATE Mar 70 NOTE 38p,

EDRS PRICE EDRS Price MF-$0.25 HC-$2.00 DESCRIPTORS *Computer Programs, *Indexes (Locaters) , *Indexing, *Information Retrieval, Lexicography, *Thesauri IDENTIFIERS *On Line Systems

ABSTRACT What is the desirability and usefulness of different thesaurus displays used either singly or in groups? Is an alphabetical listing of terms with cross references more useful to an indexer than a complete hierarchical display? Is the permuted or the rotated term index more useful to the indexer or retriever? Is an alphabetical display along with a permuted display of more use than an alphabetical display and hierarchical display? These are some of the questions raised and, at least, partially answered. The thesaurus display techniques described include the kinds for: (1) hierarchy, (2) categorization,(3) permutation and (4)semantic and syntactic relationships. Some intuitive discussion is given on displays which appear to be of more utility to the indexer or the retriever. However, no actual tests of indexers using the same thesaurus in different displays, or studies of how indexers might supplement one display with another were attempted. There is a brief discussion of the impact of the computer especially the assistance the computer offers to file update and maintenance and the impact of on-line terminals for display. (NH) ......

U,S, DEPARTMENT OFHEALTH, EDUCATION & WELFARE OFFICE OF EDUCATION THIS DOCUMENT HASBEEN REPRODUCED EXACTLY AS RECEIVEDFROM THE PERSON OR IT, POINTS OF ORGANIZATION ORIGINATING STATED DO NOT NECES VIEW OR OPINIONS OFFICIAL OFFICE OF EDU. SARILY REPRESENT CATION POSITION ORPOLICY

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Cecily J. Surace*

The Rand Corporation, Santa Monica, California

A great deal of literature exists on the development or construction of a subject authority file or thesaurus,including the importance of vocabulary control techniques.Very little exists in the literature however, on the best way to display the authorityfile or thesaurus for efficient and consistent use by the indexer and the retriever.Even less information is available on the desirability and usefulness of different displays either singly or in groups. For example,is an alphabetical listing of terms with cross references more useful to an indexer than a complete hierarchical display?What value does the permuted or rotated term index serve? Isit more useful to the indexer or retriever?To the experienced or inexperienced indexer? Is an alphabetical display along with a permuted display of greater utility than an alphabetical display and a hierarchical display?Questions of this nature are very relevant to a system designer concerned with the construction or automation of a thesaurus where cost is a great factor. Itis estimated that a thesaurus maintenance program wi I Icost between $50, 000 - $ 75,000 to design and code; some programs are available for sale at $15,000. Considering these costs,itis difficult to understand why thesauri continue to be developed and constructed with so little recorded study of alternative displays. Itis also difficult to understand why studies on indexing consistency and effectiveness have not concernedthemselves with studying the effect different displays

*Any views expressed in this paper are those of the author. They should not be interpreted as reflecting the views of The Rand Corporation or the official opinion or policy of anyof its governmental or private research sponsors. Papers are reproduced by The Rand Corporation as a courtesy-to members of its staff. of a thesaurus may have on the indexer. Instead these studies generally concernthemselves with-,omparisons of different kinds of authorityfiles, assuming the organizations using thesefiles have the same objectives, or else concern themselves with indexer consistency in terms ofexperience vs non-experience. This paper will attempt to describe severaldispky techniques for a thesaurus, including the kinds of displays ior hierarchy,categorization, permutation, and semantic and syntactic relationships.Where possible some intuitive discussion will be included on displays which appear tobe of more utility to the indexer or the retriever. No attempt was made toperform actual tests of indexers using the samethesaurus in different displays, nor was there 1 time to determine how indexers might supplement onedisplay with another. Instead, this paper may be categorized as one which raises somequestions but which is not successful in answering them, or elseonly partially successful. Included also in this paper will be a brief discuss'on of the impact ofthe computer especially in terms of the assistancethe computer offers to file update and maintenance, and the impact of on-lineterminals for display.

Thesaurus Definitions Many definitions exist for a thesaurus: "A thesaurus is an authority file which can lead the user from one concept to another via various heuristic orintuitive paths.It may be manually operated or mechanized for assignment of indexheadings." P. W. Howerton (in Newman, 1965) "An authority file...consists of a standardized, controlled vocabulary, with cross-references between the terms of the vocabulary and cross-references to terms of the vocabulary... It consists of either a controlled vocabulary or a set of crossreferences, or both." P. Reisner (in Newman, 1965)

1Only one paper was found in the literature which concerneditself with the use indexers made of different displays of a thesaurus.This was a paper by Rainey (1970) which surveyed 75 special libraries to determine howthey used the NASA and EJC/DOD thesauri, and which included a question onwhether indexers used the special indexes. "A thesaurus is a devicefor controlling anddisplaying an indexing vocabulary." T.L. Gillum (1964)

"An organized referenceof the terms acceptedand approved as astandard by participatingmembers of a specialized population in a defined areaof information, whichidentifies the scope of each termby inclusions, exclusionsand associations, the aggregate sothat all terms areclear and discrete and in arecomprehensive for communicationand identification of information in the definedarea." P. C. Daniels(1969) thesaurus is a list of In summary, anotherdefinition is offered: A authorized terms or descriptorswhich serve to standardizeand delimit con- displayed reveal cepts found inpublications, and whichwhen structured and relationships of a semantic,syntactic or hierarchical nature. The type of thesaurus ofprimary interest tothis paper is bestrepresented by the EJC-DOD thesaurus. Eugene Wall (1969) suggeststhat there are four basicprinciples for a which permits the thesaurus:the use of naturallanguage; an environment addition of newterminology; cross referencesincluding semantic and hierarchical viewpoints; and whathe refers to as "form andformat," further defined as "ease of use."There is no indicationthat the thesaurusshould be displayed in morethan one form or formatalthough Mr. Wall has thesaurus can be certainly contributedsignificantly to the various ways a really displayed. In fact, most discussionsof thesaurus displays are discussions of the techniquesused to reveal thesemantic, syntactic and hierarchical structure of crossreferences embodied in analphabetical list techniques results in a of terms. Indeed the applicationof these control display, but this is perhaps more aneffect or result of thetechniques, Or is this the rather than the startingpoint of the thesaurusconstruction. today's thesaurus builders chicken and egg syndrome? Perhaps this is because and are not concerned are operatingin a coordinateindexing environment headings or their display. with more fundamentalissues of the form of Since natural language is used and in mostcases single words (although some pre-coordinated terms are used) the philosophical discussions of direct headings vs indirect headingsor classification are almost non-existent. However,is this really so?Or are today's. thesauri with their increased use of auxiliary displays to reveal hierarchical schemes, category listings, and permuted listings intended to provide the best of all worldsnever resolved by the battles which raged in the above mentioned philosophical discussions? While the economics of building alternative displaysfor manually controlled thesauri have conditionedus to accept a single display, and that the alphabetical term display, the computer-managedor automated thesaurus on the other hand, has made alternative displays economically feasible, and asa resuit offers an opportunity to the thesaurus designer to consider new formats. Itis suggested that more study and analysis of alternative displays is essential foramore complete understanding of the

role the thesaurus plays in indexing and retrieval operations. Itis also recognized thatno discussion of thesaurus displays can avoid discussion of control technique:;.

Control Techniques Included in control techniquesare term selection, the use of abbreviations andacronyms, use of nouns or other forms, singular vs plural, and alphabetization.Additional control techniques includecross references for semantemes:synonyms, homographs, antonyms, generics, port-whole, related terms, andscope notes and parenthetical expressions to avoid ambiguity.

Alphabetical Display The alphabetical display of thesaurusterms is the most common form of display, influenced historically by the conventional alphabeticaldisplay of indexes and subject heading authority files.In its simplest form the alphabetical displayor dictionary display consists of a list of terms or -5-

descriptors in natural language order without crossreferences. Obviously this display is very limited and offerslittle assistance to the indexer or retriever, unless thelist of terms is very small and a ,quickglance reveals all the terms.No network or cross references are present tohelp the user weave his way to a morespecific or more generic level, etc. Coates (1960) refers to this display as thealphabetico-specific subject catalogue.

Inits most common form it doesinclude "see" and "see also" cross references, and attempts to provide throughthese conventions control over synonyms, class and related terms thereby offering someclassification scheme. Most modern day thesauri are notlimited to a simple alphabetical display of terms, but rather incorporate the morecomplex cross reference scheme found in the more sophisticatedalphabetico-specific subject authority files.The notation used may be differenthowever. Instead of "See" and "See also" with X and XX as reciprocals,the notation in current vogue is "See" and "Used for," and "RT" representingrelated term."RT" is also used as a reciprocal to "RT."And of course some hierarchy isincluded in the use of "NT" (narrower term) and "BT"(broader term) notations. The thesaurus or subject heading authorityfile which limits itself to the alphabetico-specific display does notprovide the user with a complete generic structure however.The classification scheme built intothe thesaurus by use of "See" and "RT" cross references israther limited and the user may have torefer to several terms before arriving atthe desired term or terms. This is a gross over-simplication of theproblems associated with the alphabetico-specific display.The reader is referred to Coates (1960) and others for more complete discussions. An alternative approach toresolve the dictionary display problems is the use of an alphabetico-classeddisplay.This authority fileis based on analphabetical display of terms with the use ofsubdivisions to reveal generic relationships. For example: -6-

Aircraft Aircraft Bombers Aircraft - Bombers Fighters or Aircraft - Fighters Supersonic Aircraft - Supersonic Transport Aircraft - Transport instead of:Aircraft see also Bombers, Fighters, etc. This form of display is helpful to the indexer because it revealsat a glance the related terms.Howe Ver, the indexeror retriever may not know which is the main class term- Aircraft, or Fighter Aircraft, or Commercial Aircraft, etc. Thus "see" referencesare required throughout the classed display, increasing the size of the file.An alternative is to provide a second display which isan alphabetical index to the classed file indicating the main or class terms. However this results in a two-step operation and double file maintenance.

The alphabetico-classed file also raises the issue of whatconstitutes a main or class term, and what is subsumed under it, and howspecific the subsumed terms should be. In addition, a termcan belong to more than one class. The modern day thesaurus generally doesnot attempt to provide a classed thesaurusas the main display.Instead a partial hierarchical display is interwoven in thecross references of the main alphabetical display, and separate hierarchical and category or class displaysare provided as auxiliary tools. Another approach to providean organic structure to the authority file is the use of inverted headings. This form of display is basedon the premise that in multiword subject headings there isone term that is more important, and this is the term the indexer and retriever willuse. Also in selecting these "key" words, and listingterms by their key word, a natural class structureis provided.Thus for example: Airplanes Airplanes, Commercial Airplanes, Fighter Airplanes, Transport Where necessary, cross references are provided from the natural language text to the inverted entry. Although inverted headings are not used in very many modern day thesauri,itis fairly safe to conclude that the complex cross reference structures prevalent today are an attempt toreveal some of the relationships that' the inverted headings accomplished. But,isit as safe to conjecture that the permuted or rotated display of thesaurus term:, is an attempt to recall the inverted heading structure?Today's thesaurus designer prefers natural language text in alphabetical order, and for good reasons.Yet he also builds category or classed displays, hierarchical, and permuteddisplays as auxiliary tools.Can this be because the computer is there and easily

provides these additional displays? Isit because programmers enjoy the additional coding?Or isit because the designer recognizes, as have librarians who designed the earlier "conventional" systems, that the development and design of a thesaurus is a verycomplex problem and requires more than a single solution? In summary,it can be said the more conventional subject authority files dispersed related concepts although each claimed to overcome this problem through the use of cross references, and they tended to use one-way generic cross references, from the genetic to the specific, and notthe reverse.Again, this is a very superficial review of conventional subject authority files which does not even mention faceted and chain indexing. The reader is referred to the literature for a complete review.

Thesaurus Display It has been said that coordinate indexing changed the future forthe subject indexer and the index designer.With the concept of coordinate indexing and its development and evolution, the modern daythesaurus was born.The reader is referred to the literature for background on coordinate indexing.A useful starting point is Jaster et al., (1962) in which a 45

pagebibliography may be found.No attempt will be made either to show -8- how the thesaurus developed and gradually adopted theconcepts of the more conventional authority files.This information is included in the literature on coordinate indexing and vocabulary control. Today's thesaurus may bean alphabetical display of terms with cross references revealing semantic, syntactic and hierarchicalstructures, or it may consist of individual alphabetical, hierarchical, permuted, and category or class displays, where the hierarchical and other displays are automatically generated from the main alphabetical display.It may also includeis "orma- tion on the number of postings for each term, andmay be tied to an on-line system which provides the indexeran opportunity to see what other documents have been indexed under specific terms.Certainly this isa more sophisticated tool than the manual systems could provide. But itis not necessarily a "new" concept to be attributed to the developers of coordinate indexing. Except for including the number of postings for each index term or descriptor in the thesaurus, thereare no new concepts that were not known and practiced in the earlier "conventional"systems.1 Indeed the indexer often referred to the card catalogto see what had been indexed previously undera given term.Until book catalogswere computer produced or on-line systems were designed, the indexer usinga coordinate index system had a more circuitous path to follow if he wantedto know what had been indexed undera particular term. Itis true however, that the earlier systems did not provide for multiple display of their subject authority files.This had to wait for the computer to make it economically feasible, not necessarily coordinate indexing.

Main Body Display 2 The alphabetic& displayof thesaurus terms is the mostcommon form of display.it generally incorporates the following conventions:

1The author is not concerned here with the indexing philosophy of coordinate indexing, only with the display of words ina thesaurus or authority file. 2 See Figures 1-7 for samples of alphabetical displays. -.9-

Main Term This is an accepted index term.Associated with it will be the notations:UF, NT, BT, RT.

UF = Used For -Main terms are often used for or in place of less desirable or unacceptable synonyms or near synonyms.

A synonym or unacceptable term will be entered in the thesaurus, but will refer to the acceptable term.

NT Narrower term.This is part of the hierarchical notation referring to a more specific term.

BT Broader term. This is part of the hierarchical notation referring to a more generic term.

RT 1,,ilated term.An RT is considered to have close association or relationship to a main term, but is not in the same class as the main term.

Additional control techniques include the use of scope notes and parenthetical expressions to reduce ambiguity and avoid semantic problems. The use of these control techniques or conventions is intended to serve as a guide to the thesaurus user(indexer or retriever) in the correct selection of terms at the required level of specificity. At least two approaches are possible in the display of the generic structure internal to the alphabetical display.The designer may elect to include all NT's and BT's associated with a term, or reveal only one level of generic structure -- one BT up and one NT down. As the example shows (see following page), the generic display provides more immediate information to the thesaurus user, and obviously saves time in the selection of the appropriate terms.The single level structure requires the user to refer to several main termsbefore the appropriate level of specificity is determined.Certainly the more complete generic structureis desirable from the point of view of the indexer or -10-

Single Level Display Generic Structure DisplaL

ABS RESINS ABS RESINS BT Acrylate copolymers BT Acrylate copolymers Acrylic copolymers ACRYLATE COPOLYMERS Acrylic resins BT Acrylic copolymers Addition resins NT ABS resins ACRYLATE COPOLYMERS ACRYLIC COPOLYMERS BT Acrylic copolymers BT Acrylic resins Acrylic resins NT Acrylate copolymers Addition resins NT ABS resins ACRYLIC RESINS BT Addition resins ACRYLIC COPOLYMERS NT Acrylic copolymers BT Acrylic resins Addition resins ADDITION RESINS NT ABS resins NT Acrylic resins Acrylate copolymers

ACRYLIC RESINS BT Addition resins NT ABS resins Asry..late copolymers Acrylic copolymers

ADDITION RESINS NT ABS resins Acrylate copolymers Acrylic copolymers Acrylic resins retriever.A possible disadvantageis the increase in size of the thesaurus. Eugene Wall (private correspondence) impliesthat this "disadvantage" may increase line entries by about 10 percent.However this may be a small penalty,if any, compared to the disadvantage of tracing the structureof the single level display. A more serious disadvantage of the sophisticateddisplay is that it does not reveal a true hierarchy because it does notdistinguish between the levels of specificity of the BT's and NT's. For instance, under Acrylic copolymers, which is the broader or more generic of the two termsAcrylic resins and Addition resins?The same type of question applies to the NT's. Perhaps a specialist in resin technology would have nodifficulty with this structure. However, not all indexers, and certainly not al! retrievers are experts in resin technology. In retrieval systems where up-posting is automaticallygenerated and ahierarchical search capability exists,itis critical that the retriever know the hierarchy, or else he may select terms which are inappropriatefor his search strategy and which will either inundate himwith excessive and/or irrelevant documents, or which will deny him the fulldisplay of documents available in the file on his subject.Of course if the indexer is unfamiliar with the hierarchy, and itis not explicitly displayed, he may index the documents at a level which is either too broad or too specific.

Hierarchical Display In order to overcome this serious disadvantage two options arepossible. Either incorporate a strict hierarchical display intothe main thesaurus, or produce an auxiliary display -- a hierarchical index.Most thesauri designers have opted for the latter approach, probablybecause the main alphabetical display with a completehierarchy would require far more sophisticatedprogramming, and would increase the bulk o" thedisplay. Hammond (1967) states to "employ thehierarchical display format throughout t

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the main body of...the DOD thesaurus the four-column format would have to have been reduced to three any;' would have addedc hundred pages to the printed book."What is not considered here is the time to be saved by the indexer and the retriever if onlyone look-up is required. The hierarchical displayas an auxiliary, provides the thesaurus user with a format which clearly outlines the levels of specificity.Thus the examples discussed above, might look like this in the display:

ADDITION RESINS Acrylic resins Acrylic copolymers Acrylate copolymers ABS resins

There certainly is no ambiguity here whether Addition resins is broader or more generic to Acrylic resins.The indentations tell the story. This form of display,as mentioned above, does require the user to search in two files-- the main alphabetical and the hierarchical files -- to determine the structure.Of courseif the user knew in advance the main term (in this instance Addition resins) he would refer to the hierarchical display immediately. Some hierarchical displays are designed (EJC-DOD, and NASA) to list as main hierarchical terms only thoseterms having no BT's and at least

two generic levels listed in the main body.Thus the index or displayis

not a complete display of all possible hierarchies in the thesaurus. (See Figs. 8-9a). An obvious advantage of the hierarchical display is that it reveals all levels of specificityat each main term subsumed under a class term (has no BT).This does however, raise the shadow of earlier discussions on hierarchical or classed authority files.What really constitutes a class term? Certainly notan artificial convention such as:No BT.And on what basis is a term subsumed underone class and not another?Can a term belong to more than one class?Perhaps the answer to these questions -13- is to be found in the following quotations fromthe Information Retrieval Thesaurus of Education Terms:"Our major consideration in constructing a BT-NT hierarchy has been that hierarchy's potentialusefulness in indexing and searching.Whether or not the hierarchy effectively mirrors some definite 'objective' reality has not always been ofcrucial practical, importance."

Permuted Display Gillum (in Daniels, et al., 1969) states that the permuted orrotated index is "essentially a computer sort or KWIC index ofthe words in the vocabulary...Since each word in each term is an entry point,all terms having (significant) words in common file together and provide acollection point for terms that are separated because of the useof direct entries." Thesauri that use natural language, may exhibit a rotated index to serve the same purpose as an inverted file. (See Figs.10-11).Obviously itis useful only when a thesaurus utilizes multi-word or pre-coordinated terms. If uniterms in their strictest sense comprise the thesaurus,there would be no need for permutations. The permuted index (inverted file)is probably of more use to the uninitiated or inexperienced indexer (Wall, privatecorrespondence) and retriever, although there is no discussion of the utility ofthis auxiliary display.Can it be the thesaurus designer is hedging his bets and wants to cover all aspects ofbuilding an authority file because the computer is there?

Category Index Another form of display for a thesaurus is the categorydisplay which is intended to divide or segment the thesaurus' terms intobroad subject or class areas less rigid than the hierarchical display.The categories, which can be based ondiscipline, on taxonomy, etc., bring together terms that belong to a group, but which normally are interspersed throughoutthe -14-

alphabetical display.It appears the groups can be, and indeed are, arbitrarily selected.One basic requirement is that they be mutually exclusive although this in fact may be difficult to achieve since some terms will fall into more than one group. The EJC-DOD thesaurus for example, utilizes the COSATlilub"ect Categor y Index as the basis for its category display. (See Figs.12-13). Gillum (in Daniels, et al.,1969) states that the subject category "displays are believed to be reasonably coherent and of useful content, but the real utility of this display has not been determined." He does suggest however, that it would contribute to the indexing and retrieval operations "when itis necessary to determine generally the scope of depth of vocabulary development in some subject area." Since this display is

intended to bring together terms that represent a logical grouping itis conceivable the individual groups would contribute to the development of microthesauri, but itis difficult to determine to what extent. Tancredi and Nichols (1968) describe how they developed the Microthesaurus of Air Pollution Terms by establishing broad categories for the terms and then extending them to more specific subcategories.(Refer to Fig.14). They also display a hierarchical treatment of the terms within the categories which invites the thought that perhaps the hierarchical display should also be considered as usefulin the development of a microthesaurus. It may be the only certain use of the subject category display is in developinga means for assigning terms to categories which reflect the categories used in an announcement bulletin. This serves as a useful guide to the listing of new documents in the bulletin, based on the index terms assigned to the documents, and the categories the terms represent in the category display.The DDC Technical Abstract Bulletin and NASA STAR are examples of this usage. In summary it appears this display assists the indexer or retriever the least. If the indexer was responsible for assigning documents to specific -15

categories for announcement in abulletin,its utility would be increased, but this is done by the computer program.

Role of the Computer The introduction of the computer tothe construction and maintenance of the thesaurus has significantlyaltered the display of the thesaurus and greatly reduced the human editing andmaintenance operations. As was mentioned earlier, the automatedthesaurus can be programmed to generate reciprocals, check for completeness of crossreferences and their consistency. More sophisticated programs canprovide for hierarchical completenessand consistency. Editing of spelling, termacceptability, term length, etc.is an easycapability of these programs, as well asfile update and maintenance. Some programs also include automaticup-posting capability. While the state of the art indicates itis relatively simple to design and code a program to automatically generateand check reciprocals for a single level hierarchical structure,itis. quite another ball game todesign a program to generatereciprocals for a full hierarchicaldisplay. It has been estimated (and experienced) that this typeof program costs upwards of

$50,0001 Thus the economic considerationsgreatly influence the design and completeness of the thesaurus.However, economic considerations must also includecost-benefit considerations. A complete hierarchical display with automatic generation ofreciprocals and editing capability is great, but is the cost ofdesigning and coding this programoffset by greater indexing and retrieval effectiveness?For instance what is thecost-benefit of all the auxiliary displays discussedabove? How are they used and how often, by indexers and retrievers?Are they all required?Or have we fallen into the old trap of manipulatingdata and producing additional reports as a gimmick tojustify computer costs? It would seem an automated thesaurus can reduce indexing andretrieval time, and greatly reducehuman editing and file maintenance.Certainly an automated thesaurusshould be

asubsystem of an automated retrieval system.What the author doesn't know is how sophisticated should that thesaurus be? It has been said that an informationretrieval system is successful in proportion to the success or effectiveness of its thesaurus and the indexing operation.But at what cost? The computer has also contributed to the development of the thesaurus by providing the capability of counting the frequency of use of terms thereby offering the opportunity to introduce more specific, or broader terms as required. Itis truein the conventional systems the card catalog served the same purpose.An indexer could decide it was time to break down a term because of the number of cards filed under it.But the maintenance problem was prohibitive and most indexers tended to avoid noticing the file size. In an automated environment however, correction of posting is relatively simple and encourages file maintenance. Claire Schultz, et al. (1961) refer to the "combining power" of terms. If an indexer or retriever knows the number of times an index term hasbeen used,it reveals something about the"combining power" of the term, The authors conclude that "... individual descriptors have the ability tocombine with other descriptors in proportion to the frequency with which they are used singly.An infrequently used descriptor has little combining power; a frequently used descriptor has high combining power." By associating the thesaurus file with the frequency of postings,the computer provides the indexer with a powerful tool to adjust index terminology. Terms with weak combining power can be eliminated or included in broader terms; termsthat have excessive combining power (over-posted) can be made more specific. Thus the thesaurus becomes a more dynamic authority file. It was mentioned earlier that the card catalog served as a guide to the indexer revealing which documents had been indexed under certain terms. Coordinate index systems made this a more difficult operation. However, the computer has again contributed to this area with the introduction of on-line systems. In such an environment the indexer can search the thesaurus files,note the number of postings under the coordinate termsand -17-

also ask for an on-linedisplay of some of the documentreferences already indexed under the terms,and note the additional termsused to index these documents. (The card catalogrevisited?)This form of display can assist in increasing correct usageof terms and contribute toindexer consistency. And of course thebenefits to the retriever areequally useful. Such a the system isdescribed by Bennett (1969).The reader is also referred to Lockheed Dialog system andthe NASA Recon system. A further extensionof the use of on-line systemsin an indexing environment appeared in theliterature recently, but thereference has been catalog lost. Essentially, the indexer refers to anautomated on-line card the and attempts to determineif the bibliographicreferences or citations in article to be indexed, arealready entered into the cardcatalog. If any of the citations arethere, the indexer nextasks to see the index terms assigned to these citations,thereby gaining some clues as towhich terms This method is may belikely candidates for indexingthe article in hand. an extendedcitation indexing approachwhich reveals the superior power of an on-line systemfor improving indexingconsistency and effectiveness. Although this discussion ofthe impact of the computeris brief,it should not be interpreted as asnub. The computer hasdramatically altered the field of informationanalysis, storage andretrieval, and has broadened the horizons of librarians anddocumentalists. Without it information retrieval would still be inthe dark ages. -18-

REFERENCES

Bennett, J.L. On-line access to information:NSF as an aid to the indexer/cataloger.American Documentation, July 1969, pp.213-220.

Coates,E.J. Subject catalogues:headings and structure. London, The Library Association, 1960, 186 p.

Daniels,P. C., et al.The thesaurus in action. Background information for a thesaurus workshop at the Annual Conventionof the American Society for Information Science (32nd), October1969, San Francisco, California.October 1969, 39 p.

Gillum, T.L. Compiling a technical thesaurus.Journal of Chemical Documentation, January 1964, pp. 29-32.

Newman, S. M. Information systems compatibility. Spartan, 1965.

Rainey, L.Experiences with the new TEST Thesaurus and the new NASA Thesaurus. Special Libraries, Vol. 61, January 1970, pp. 26-32. Schultz, C. K., et al.A comparison of dictionary use within two information retrieval systems.American Documentation, October 1961, pp. 247-253.

Tancredi,S. A. and Nichols, 0. D.Air pollution technical information processing -- the microthesaurus approach.American Documentation, January 1968, pp. 66-70.

Wa I I, E. Persona Icorrespondence. 24 November 1969.

Wall, E.Vocabulary building and control techniques.American Documentation, Vol. 20, April 1969, pp. 161-164.

ADDITIONAL REFERENCES

American Institute of Chemical Engineers.Chemical engineering thesaurus. 1961.

American Petroleum Institute.Subject authority list. 1966.

Blagden, J.F. Thesaurus compilation methods:a literature review. ASLIB Proc., Vol. 20, August 1968, pp. 345-359. -19-

Cain, A. M.Thesaural problems in an on-line system. Bull. Med. Libr. Assn., Vol. 57, July 1969, pp. 250-259.

Castner, W. G., et al. The MECCA vocabulary control system for library collections.The Boeing Co., 1968, 21 p.

COSATI. Guidelines for the development of information retrieval thesauri. 1967. 9 p.

EJC/DOD.Thesaurus of engineering and scientific terms. December 1967.

Eller,J.L. and Panek, R.L. Thesaurus development for a decentralized information network.American Documentation, July 1968, pp. 213-220.

FAA thesaurus of technical descriptors,1969.

Fried, C. and Prevel, J.J. Effects of indexing aids on indexing performance. General Electric Co., October 1966,192 p.RADC-TR-66-525.

General Electric.Apollo Support Department. Thesaurus development and guides for indexing and search functions.April 1963.

Grosch, A. N. Thesaurus construction. Special Libraries, Vol. 60, February 1969, pp. 87-92.

Gull, C. D.Structure of indexing authority lists. Library Resources and Technical Services, Vol.10, No. 4,Fall 1966, pp. 507-512.

Hohnecker, W. and Newmark, M.Automated maintenance of a highly structured thesaurus at Engineering Index.N.Y., American Documentation Institute Proceedings, 1967.

Holm, B.E. and Rasmussen,L. De -eiopment of a technical thesaurus.

American Documentation, Vol. 1 July 1961, pp. 184-190.

Information retrieval thesaurus of education terms.Cleveland, Ohio, The Press of Case Western Reserve University,1968.

Joyce, T. and Needham, R. M.The thesaurus approach to information retrieval.American Documentation, Vol. 9, No. 3,1958, pp. 192-197.

Korotkin, A. L., et al. Indexing aids, procedures and devices. General Electric Co., April 1965, 106 p.RADC-TR-64-582. -20-

Lynch, M. F.Computer-aided production of printed alphabetical subject indexes. Documentation, September 1969, pp. 244-252.

McClelland, R.M.A. and Mapleson, W. W. Construction and usage of classified schedules and generic features in co-ordinate indexing. As lib Proceedings, October 1966, pp. 290-299.

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Acyl halides ea 6c,,bTHESAURUS OF ENGINEERING AND SCIENTIFIC TERMS Acyl halides0703 RTAlkylation Diluents Dissimilar materials bonding DTAcid halide', Animation Dopes Adhesive gropers1112 1101 NTAcetyl chloride Catlaniylation Drying oils BTPapers Acyllransferases 0601 Cat boxylation Extenders RT AdliesNe tapes ST Enzymes Decarboxylallm Fillers Adhesive pool test Transforases Esterilication Galling agents USE Pool tests Adamant. Ethordication Interstitials Adhesives1101 USE Quartz monzonite Grignard reactions Lubricants UF tBinders (adhesives) Adaptability Halogenation Naphthas Cements (adhesives) USE Adaptation Hydration Opacifiers NT Glue Hydrogenation Pigments 1407 Pressure sensitive adhesives Adaptation Metalation UFAdaptability Plasticizers Rubber adhesives Nitration Preservatives RT Adhesion NTAcclimatization Phosphorylation Adjustment (psychology) Solvents Binders (materials) Dark adaptation Addition resins1109 1110 Stabilizers (agents) Bonding strength ATAcuity Carbon-chain polymers; for Thickeners (materials) Cohesion Compensation hoteroatom chain polymers atm Thickness Epoxy resins Correction Polyether resins Additions Fasteners Fitting t)FAddition polymers USE Radial beam tubes Joints (jcnctions) -.Hibernation NT ABS resins Addressing1407 Sealers Homeostasis Acrylamide copolymers RTCoding Setting time Reaction time Acrylate copolymers Computer programming Adhesive strength2012 Acrylic acid copolymers Sensitivity BTMechanical properties Acrylic copolymers Address registers Thresholds (perception) USE Registers (computers) RTAdhesion Acrylic resins Bonding strength Adapters1305 Acrylonitrile copolymers Adenines 0601 0703 Casing tools Peel strength RT Butyl rubber 6-Aminopurin and its derivatives Extensions STHeterocyclic compounds Shear strength Chloroprene resins Surface properties Fittings Diane resins Nitrogen heterocyclic compounds Sleeves Tensile strength Ethylene copolymers Nitrogen heterocyclics with 4 N Adaptive communication 1702 .Ethylene resins Purines Adhesive tapes1101 BTBinding tapes BTTelecommunication Halocerbon resins NTAdenosines Adaptive control Olefin copolymers Puromycin RT Adhesive papers USE Adaptive systems Olefin resins Adanocsreinomes 0605 Adhesive tests and Automatic control Polyacrylamides PTMalignant neoplasms USE Adhesion tests Adaptive electric Men Polyacrylates Neoplasms Adiabatic conditions 2013 USE Adaptive systems Polyacrylic acids RTBreast carcinoma RTEnthalpy and Electric filters Polyacrylonitrile Adenoma 0605 Environments Adaptive optical filters Polybutadiene BTBenign neoplasms Heat USE Adaptive systems Polychloroprene Neoplasms Temperature and Optical filters Polychlorotrifluoroethylensi RTBreast neoplasms Adiabatic demagnetisation 2012 Adaptive systems 1407 Polyethylene Adenosine phosphates 0601 0703 UF Magnetic cooling UF tAdaptive control Polyisobutylerie BTEsters BT Cooling tAdaptive electric filters Polyisoprene Nucleotides RTCryogenics tAdaptive optical filters Polymethyl methacrylate Organic phosphates Refrigerating NTLearning machines Polypropylene Phospho"us organic acid esters Adiabatic flow2004 RTArtificial intelligence Polystyrene Phosphorus organic compounds BT Fluid flow Automata theory Polyvinyl acetate Adenosines 0703 0601 Adios syndrome 0605 Automatic control Polyvinyl alcohol ST Adenines BT Eye diseases Cybernetics Polyvinyl chloride Hoerocyclic compounds Signs and symptoms Process control Polyvinyl fluoride Nitiogen heterocyclic compounds Adipates 0703 Styrene butadiene ruins Self organizing systems Nitrogen heterocyclics with 4 N 13T Aliphatic acid esters Adcock antennas 0905 Styrene copolymers Nucleosides Carboxylic acid esters ST Antennas Styrene resins Purines Dibasic acid esters Directional antennas Tetrafluoroothylene resins NT Puromycin Esters Adders Viny acetyl resins Adenoviruses 0613 Viny acetate Adiphenino 0615 USE Adding circuits BTViruses Cholinergic blocking agents Viny acetate copolymers RT Adder subtracters NTAcute respiratory disease virus Adipic acid0703 Viny acetate resins Oncogenic viruses USE Adding circuits Viny chloride copolymer* STAliphatic acids Adding circuits0901 Polyoma viruses Carboxylic acids Viny chloride resins Adenovirus infections UFAdders Viny copolymers Dibasic organic acids Adder subtracters Viny ether ruins USE Raspiratory infections Organic acids Subtracters Viny Wens chloride resins Adherence Adiponitrile0703 STCircuits Viny krone resins USE Adhesion ST Nitriles RTAccumulators (computers) Viny resins Adhesion1407 Adipose tissue Computer components RT Addi ion polymerization UP Adherence USE Connective tissue Logic circuits Crosslinking Sticking (adhesion) Adits0809 Adding machines 1505 Foam rubber Tackiness 13T Tunnels STCalculators Graft polymerization STSurface properties RTMine shafts Office equipment Plastics processing RT Adhesive bonding Adjective law 0504 Office machines Polymeric films Adhesives BY Law (jurisprudence) Addison* disease 0605 Synthetic fibers Adhesive strength Public law OTAdrenal cortex diseases Vulcanized elastomers Adsorption AT Common law Endocrine diseases Additions (enlargenr,ents) Bonding Criminal law Hypendronalism USE Extensions Cementing Decisional law Cohesion RTHypotension Additives1107 Substantive law Tuberculosis Dissimilar materials bonding UF Doping (additives) Adjusting1407 Fusion (melting) Addition 1201 Modifiers UF 'Pelf adjusting Gluing UF Summing PAW additives RT Accounting STArithmetic Internal pressure Alignment NT Admixtures Laminating Number theory Antlicing additives Clearances Addition polymerisation0703 Peeling Antiknock additives Sealing Collimation STAddition reactions Cement additivet Correction Chemical reactions Seaming Fitting Extreme pressure additives Shear tests Polymeiization Food additives Focusing RTAddition resins Surface chemistry Leveling Fuel additives Taping Condensation polymerization Liquid rocket additives Matching Wetting Elastomers Lubricant additives Positioning Graft polymerization Metal deactivator. Adhesions (Intestines)0605 Revisions Polyether resins Paint thinners RTGastrointestinal diseases Setting (adjusting) Thermoplastic resins Pulp additives Intestinal obstructions Smoothing Thermosetting resins RTAntifreezes Adhes!on tests1402 Straightening Addition polymers Antioxidants UF Adhesive tests Adjustment (psychology) 0510 USE Addition resins Antistatic agents NTPeel tests UF Maladjustment Addition reactions0703 Brighteners Adhesive bonding1308 BTAdaptation BT Chemical reactions Coatings BTBonding AT Abnormal psychology NTAddition polymerization Corrosion inhibitors RTAdhesion Anxiety 16 Subject Category Index numbers follow main terms; () eg See main entry for narrower terms; t Consult main entry; -24-

ABNORMALITIES NASA THESAURUS (ALPHABETI(AL LISTING) (CONoT)

ECCENTRICITY (USE OF A MORE SPECIFIC TERM IS IRREGULARITIES RECOMMENDED- - CONSULT THE TERMS UNIQUENESS LIMO BELOW) ABORIGINES MT AOSORUNTS 0404 3402 AUSOROCRS (EQUIPMENT) MT ANTHROPOLOGY ABSORBERS (MATERIALS) HUMAN BEINGS NATTENUATORS INHABITANTS CLEANERS ABORT APPARATUS OSCILLATION DAMPERS 0203 3102 3103 SHOCK ABSORBERS OT SAFETY DEVICES VIBRATION ISOLATORS RT ABORTED MISSIONS ABSORBERS (EQUIPMENT) AIRCRAFT SAFETY 0602 1504 ARRESTING GEAR (EXCLUDES EQUIPMENT FOR ABSORBING BARRIERS ENERGY) BRAKES (FOR ARRESTING MOTION) RT ABSORBENTS DRAG DEVICES ABSORBERS EJECTION SEATS ABSORBERS (MATERIALS) EQUIPMENT AIR CONDITIONING EQUIPMENT ESCAPE CAPSULES CLEANERS ESCAPE ROCKETS COLUMNS (PROCESS ENGINEERING) ABORT TRAJECTORIES CONDENSERS (LIQUIFIERS) 1904 3006 3102 3103 COOLING SYSTEMS OT TRAJECTORIES DEGASSING MT ABORTED MISSIONS DRYING APPARATUS MATTS (SYSTEMS) EQUIPMENT ABORTED MISSIONS MATERIAL ABSORPTION 3102 3103 REFRIGERATING MACHINERY MT ABORT APPARATUS SHOCK ABSORBERS ABORT TRAJECTORIES ABSORBERS (MATERIALS) DESTRUCTION 0602 1504 1805 ENGINE FAILURE (EXCLUDES ABSORBENTS--LIMITED TO ESCAPE CAPSULES MATERIALS FOR ABSORBING RADIATION ESCAPE ROCKETS RATHER THAN OTHER MATERIALS) FAILURE NT NEUTRON ABSORBERS MALFUNCTIONS RADAR ABSORBERS MISSIONS SOLAR ENERGY ABSORBERS ABRASION MT ABSORBENTS 0405 1504 1801 1606 ABSORBERS RT ABRASIVES ABSORBERS (EQUIPMENT) CHIPPING OATTENUATORS CLEANING CLEANERS CUTTING ELECTROMAGNETIC ABSORPTION DRY FRICTION *ELECTROMAGNETIC WAVE FILTERS EROSION ('ENERGY ABSORPTION FILES (TOOLS) FILTERS FRICTION HEAT SINKS GRINDING (MATERIAL REMOVAL) INSULATION LESIONS JACKETS METALLCGRAPHY MATERIALS PULISHING RADIATION SHIELDING SCORING REFRIGERANTS WEAR *SHIELDING ABRASION RESISTANCE SINKS 1503 1504 STOPPING POWER BT MECHANICAL PROPERTIES SUPPRESSORS AT HARDNESS ABSORPTANCE RESISTANCE 2310 TOUGHNESS BT ('ELECTROMAGNETIC PROPERTIES ABRASIVES OPTICAL PROPERTIES 1504 1801 1805 1806 RT ABSORPTION SPECTRA NT CARBORUNDUM (TRADEMARK) ABSORPTIVITY RT ABRASION ALBEDO ALUMINUM OXIDES CAPTURE EFFECT CERAMICS COSMIC RAY ALBEDO DIAMONDS DENSITY (MASS/VOLUME) GRIT EARTH ALBEDO PUMICE ELECTROMAGNETIC ABSORPTION QUARTZ LIGHT TRANSMISSION SIICON CARBIDES OPACITY ABSCISSAS REFLECTANCE USE COORDINATES SURFACE PROPERTIES ABSOLUTE TEMPERATURE SCALES TRANSMISSION USE TEMPERATURE SCALES TRANSMISSIVITY ABSORBENTS TRANSMITTANCE 0602 0603 1805 TRANSPARENCE OF MOLECULAR SIEVES TURBIDITY BT SORBENTS ABSORPTION AT ABSORBERS 3407 3408 ABSORBERS (EQUIPMENT) (USE OF A MORE SPECIFIC TERM IS ABSORBERS AMATERIALS1 RECOMMENDED -- CONSULT THE TERMS ADSORBENTS LISTED BELOW) AIR CONDITIONING EQUIPMENT AT ABSORPTION SPECTRA OESICCANTS ADSORPTION MATERIAL ABSORPTION ATOMIC COLLISIONS MATERIALS ('ATTENUATION ABSORBERS BENEFICIATION 0603 1409 1504 2202 2405 2901 3203 CAPTURE EFFECT 3303 COLLISION PARAMETERS

2 A E MECHANICS USE AVIATION MECHANICS THESAURUS OF ICABSTRACTING DESCRIPTORSST WRITING PAGE ABILITY NTOF LOWACACEmIC ABILITY ABILITY ABSTRACTION TESTSRT INDEXINGCoCUKENTATION LANGUAGECOGNITIVEPSYCHOMOTORPREDICTIVEINTELLIGENCE ABILITYABILITY ABILITY SKILLS (TESTING) ACADEMIC ABILITYRTST COMPARATIVECOGNITIVETESTS TESTS TESTING RT APTITUDEACHIEVEMENTABILITYVERBAL ABILITYIDENTIFICATIONGROUPING KTBTOF ABLE STUDENTS ACADEMICABILITYSCHOLASTICACADEMIC APTITUDE ACHIEVEMENTABILITY PERFORMANCEMECHANICALHANDICAPPEDGIFTEDASPIRATION SKILLS COGNITIVEAVERAGEACADEMICALLYACADEMIC STUDENTS PERFORMANCEASPIRATIONABILITY HANDICAPPED TALENTEDPRODUCTIVITYTALENTSLOW LEARNERS STUDENTS VERBALLOWSTUDENTSSTUDENTINTELLIGENCE ABILITY ABILITY ABILITY STUDENTS ABILITY GROUPINGRTST HOMOGENEOUSABILITYSTUDENT IDENTIFICATION GROUPING GROUPING ACADEMIC ACHIEVEMENTOF ACADEMICEDUCATIONALACADEMIC SUCCESS PROGRESS ACHIEVEMENT ABILITY IDENTIFICATIONRTST LOWABILITY IDENTIFICATIONABILITY STUDENTS STUDENTSCHOOLSCHOLASTICEDUCATIONAL ACHIEVEMENTACHIEVEMENT ACHIEVEMENT LEVELATTAINMENT ABLE STUDENTS (ABILITY TO PERFORM OR ABSORB EDUCATIONABILITY IDENTIFICATIONAT A SPECIFIEDGROUPING TESTS RTST ABLEACADEMICACHIEVEMENT STUDENTS ASPIRATIONAPTITUDEABILITY SUrLEVEL) T STUDENTSCAPABLE STUDENTS ADVANCEDACHIEVEMENTACADEMIC PROBATIONPERFORMANCEPLACEMENT RATING RT GIFTEDAVERAGEADVANCEDACADEMIC STUDENTS STUDENTSACHIEVEMENTABILITY HIGHINTELLIGENCEGRADESGIFTED ACHIEVERS (SCHOLASTIC) ABSTRACT BIBLIOGRAPHIESUSE ANNOTATED BIBLIOGRAPHIES SUPERIOR STUDENTS SUPERIORSTUDENTSREADINGLOWLEARNING ACHIEVERS ACHIEVEMENTSTUDENTSDIFFICULTIES ABSTRACT REASONINGRTS T LOGICALCOGNITIVETHOUGHT THINKINGPROCESSES PROCESSES ACADEMIC APTITUDEOF LOWUNDERACHIEVERS SCHOLASTIC APTITUDE prOGuCTIvE THINKING RTST ACADEMICAPTITUDESTUDENTSCHOLASTIC APTITUDE ABILITY APTITUDE -26- II- el 641

t LI

Acceleration Integrators RT ABSORPTION ADHESIVE TAPES USE ACCELEROMETERS ACOUSTIC PROPERTIES UT ADHESIVES ACCELERATION TOLERANCE UF Physical properties (Acoustic) TAPES BT TOLERANCES (PHYSIOLOGY) NTACOUSTIC IMPEDANCE ADHESIVES RT BLACKOUT (PHYSIOLOGY) SOUND TRANSMISSION UF Glues ABANDONMENT ACCELEROMETERS RT HARMONIC ANALYZERS Metal-glass adhesives UF Escape (Abandonment) UF Acceleration integrators HARMONIC OSCILLATORS Metal-plastic adhesives NT BAILOUT ACCEPTABILITY NOISE Metal-rubber adhesives RT DITCHING RT MAINTAINABILITY RESONANCE Metal-wood adhesives ABDOMEN QUALITY CONTROL STANDING-WAVE RATIOS NT ADHESIVE TAPES BT BODY STANDARDS ACOUSTIC RANGES SEALING COMPOUNDS RT GAS SEALS Abelian field* TOLERANCES (MECHANICS) RT HYDROPHONES ACCIDENT INVESTIGATION ACOUSTICS JOINTS USE ALGEBRA METAL JOINTS RT ACCIDENTS (Theoretical studies of the production, ABLATION METAL SEALS AVIATION ACCIDENTS and reception of elastic RT AERODYNAMIC HEATING SEALS (STOPPERS) AVIATION INJURIES Wes.; wnves in all type of meth., For AEROTHLFIMOELASTICITY thenrolics1 studies of waves in the Adjustable-pitch propellers COOLING AVIATION SAFETY ACCIDENTS audihIn froquency, ton SOUND) usr VAtUAt i r PITCH PlIOPELLEFIS EROSION RT ANECHOIC CHAMBERS ADJUSTMENT (PSYCHOLOGY) NT AVIATION ACCIDENTS SUBLIMATION MECHANICAL, WAVES COLLISIONS UF Adaptability (Psychology) VAPORIZATION PSYCHOACOUSTICS BEHAVIOR MOTOR VEHICLE ACCIDENTS BT ABNORMAL PSYCHOLOGY SOUND RT CONDITIONED REFLEX RT ACCIDENT INVESTIGATION (Includes general Investigations of ULTRASONIC RADIATION GROUP DYNAMICS CASUALTIES irregular mental phenomena LEADERSHIP DISASTERS ACRYLIC RESINS including behavior or mental UF Lucite PSYCHOLOGY EXPLOSIONS disorders, dreams, hallucinations, Perspex FIRES ADMITTANCE and mental retardation. For Plexiglas FIRST-AID Adrenal cortex hormones prevention, diagnosis, and therapy of Polymethylmsthacrylate HAZARDS USE CORTICOSTEROID AGENTS *motional disturbances, see UT PLASTICS PSYCHIATRY) RESCUES ADRENAL GLANDS SAFETY Activated carbon BT ENDOCRINE GLANDS UFClinical psychology USE CARBON Psychopathology SURVIVAL GLANDS WOUNDS & INJURIES ACTUATORS ADRENAL MEDULLA HORMONES ST PSYCHOLOGY (For actuators with feedback, toe NT PSYCHIATRY ACCLIMATIZATION BT HORMONES SERVOMECHANISMS, For STRESS (PSYCHOLOGY) (Physiological adjustment to climatic NT EPINEPHRINE conditions.) indicators, see SYNCHROS,) LEVARTERENOL RT ANXIETY NT EXPLOSIVE ACTUATORS DT ADAPTATION (PHYSIOLOGY) RT AUTONOMIC AGENTS BEHAVIOR HYDRAULIC ACTUATORS CRIMINOLOGY ACHIEVEMENT TESTS SYMPATHOMIMETIC AGENTS RT SERVOMECHANISMS Adrenalin EMOTIONS (Standardized educational tests SOLENOIDS FEAR constructed to sample the ACUITY USE EPINEPHRINE SENSORY DEPRIVATION proficiency level or adequacy of put Adrenergic agents NTVISUAL ACUITY learning in any given field of study) USE SYMPATHOMIMETIC AGENTS Abrasion RT PERCEPTION BT PSYCHOMETRICS USE ABRASIVES SENSORY MECHANISMS Adrenerglc nerves RT INTELLIGENCE TESTS Abrasion resistance THRESHOLDS (PHYSIOLOGY) USE AUTONOMIC NERVOUS SYSTEM PSYCHOMOTOR TESTS USE WEAR RESISTANCE TOUCH ADRENOCORTICOTROPIC Abrasive coatings ACID-BASE EQUILIBRIUM Adaptability (Psychology) HORMONE USE ABRASIVES Acidernia USE ADJUSTMENT (PSYCHOLOGY) UF Corlicotropin ABRASIVES USE ACIDOSIS ADAPTATION (PHYSIOLOGY) BT HORMONES UFAbrasion Acidity UFAltitude adaptation ADRENOCORTICOTROPIC Abrasive coatings USE PH Dark adaptation HORMONES Broach powders ACIDOSIS General adaptation syndrome UF ACTH Commute* stones UF Acidemia Light adaptation Corlicotropin Grinding n; serials ACOUSTIC DETECTORS Night vision BT HORMONES RT CORUNDUM BT ACOUSTIC EQUIPMENT NT ACCLIMATIZATION PITUITARY HORMONES DIAMONDS DETECTION RT STRESS (PHYSIOLOGY) Adsorbents ABSORPTION DETECTORS ADAPTIVE CONTROL SYSTEMS USE ADSORPTION (the retention and conversion into RT MICROPHONES (Control systems that continuously ADSORPTION another form of energy of rays, POSITION FINDING measure and evaluate dynamic UF Adsorbents waves, or particles by a substance.) ACOUSTIC EQUIPMENT performance and supply continuous BT SORPTION RT ACOUSTIC INSULATION UF Sound equipment readjustments on the basis of the SURFACE PROPERTIES ATTENUATION NT ACOUSTIC DETECTORS evatuations,) Aeolipile rotors DESICCANTS ACOUSTIC FILTERS UF Self-adaptive control systems USE JET HELICOPTER ROTORS RESONANCE ABSORPTION ANECHOIC CHAMBERS 8T CONTROL SYSTEMS AERIAL CAMERAS SHIELDING ELECTROACOUSTIC ADDITIVES BT CAMERAS SURFACE PROPERTIES TRANSDUCERS NT ANTIOXIDANTS RT RADAR RECORDING CAMERAS VIBRATION ISOLATORS HYDROPHONES FUEL ADDITIVES WIDE-FIELD CAMERAS Abstracting MEGAPHONES LUBRICANT ADDITIVES AERIAL PHOTOGRAPHS USE ABSTRACTS MICROPHONES Adenine BT PHOTOGRAPHS ABSTRACTS NOISE GENERATORS USE PURINES RT MOTION PICTURES UF Abstracting SOUND GENERATORS Adenine derivatives AERIAL PHOTOGRAPHY Briefs SOUND REPRODUCTION USE PURINES BT PHOTOGRAPHY Resumes SYSTEMS Adenosine RT AERIAL RECONNAISSANCE Summaries RT HARMONIC ANALYZERS USE PURINES AERIAL PICKUP SYSTEMS BT DOCUMENTATION HARMONIC OSCILLATORS ADENOSINE PHOSPHATES BTAIRCRAFT EQUIPMENT RT REPORTS NOISE UPAdenylic acid RT AIR-DROP OPERATIONS ABUNDANCE ACOUSTIC FILTERS ADP Aerial propellers UF Availability BT ACOUSTIC EQUIPMENT ATP USE PROPELLERS (AERIAL) Acaricides ACOUSTIC IMPEDANCE RT MUSCLES AERIAL RECONNAISSANCE USE PESTICIDES UF Impedance (Acoustics) NUCLEOSIDES RT AERIAL PHOTOGRAPHY ACCELERATION ST ACOUSTIC PROPERTIES NUCLEOTIDES AIR FORCE OPERATIONS UFG-forces RT IMPEDANCE MATCHING Adenylic acid PHOTO INTERPRETATION ST MOTION ACOUSTIC INSULATION USE ADENOSINE PHOSPHATES PHOTOGRAMMETRY RT DECELERATION UFInsulation (Acoustic) ADHESION RECONNAISSANCE PLANES THRUST Insulators (Acoustic) RT BONDING AERIAL RUDDERS VELOCITY Soundproofing SURFACE PROPERTIES UF Rudders (Aerial) Subject Category Index numbers follow main term; () See mein entry for narrower terms; t Consult main entry; USE se Use preferred Wm; UF Used For: ST Broader Term NT Narrower Term; RT IN Related Tenn. Astse:. -27- ALPHAUTICAL LIST (kirk, 1(1(cil , + ABR TEST + (2-CHLOROETHYL) TRIMETHYLAMMONIUM ri,(11. . c- CHLORIDE 11E + USE MILK RING TEST 048 + UF CCC + CYCOCEL + ABUTILON THEOPHRASTI + BT PLANT REGULATORS + USE CHINA JUTE I1A ABACARUS HYSTRIX 07E + ACACIA 11C + UF GRAIN RUST MITE + UF WATTLE (TREE) + BT LEGUMINOSAE + ABGRALLASPIS 07E + BY DIASPIDIDAE + ACACIA ARABICA 11F + UF BABUL ACACIA + ABGRALLASPIS HOWARDI 07E + UF HOWARD SCALE + ACACIA CATECHU 11C + UF KHAIR ABIES 11F UF FIR + ACALYMMA VITTATUM 07E BT CONIFERAE + UF CUCUMBER BEETLE STRIPED CUCUMBER BEETLE ABIES ALBA 11F + UF SILVER FIR + ACANTHOCEPHALA 04B + ST NEMATHELMINTHES ABIES AMABILIS 11F UF AMABILIS FIR + ACANTHOLYDA ERYTHROCEPHALA 07E CASCADES FIR + UF PINE FALSE WEBWORM PACIFIC SILVER FIR a ACANTHOMA 10E ABIES BALSAMEA 11F + BT NEOPLASMS + UF BALSAM FIR + ACANTHOSCELIDES OBTECTUS 07F + ABIES CEPHALONICA 11F + PF BEAN WEEVIL + UF GREEK FIR + ACARIASIS 048 ABIES CONCOLOR I1F + RT MITES UF WHITE FIR + ACARID MITES ABIES GRANDIS 11F + USE ACARIDAE 07H + UF GRAND FIR LOWLAND FIR + ACARIDAE 07H + UF ACARID MITES + ABIES LASIOCARPA 11F + NT TYROPHAGUS + UF ALPINE FIR + BT MITES

+ ABIES MAGNIFICA 11F + ACARINA 07H + UF CALIFORNIA RED FIR + NT MITES + RED FIR + TICKS + BT ARACHNIDA + ABIES PINDROW 11F 07F + UF PINDROW FIR + ACARUS SIRO + UF C:IEESE MITE + ABIES PINSAPO 11F + GRAIN MITE + UF SPANISH FIR + ACER 11F + ABIES PROCERA 11P + UF MAPLE + UF NOBLE FIR + BT ACERACEAE

+ ABIES RELIGIOSA 11F + ACER MACROPHYLLUM 11F + UF PINABETE + UF BIGLEAF MAPLE SACRED-FIR BROADLEAF MAPLE

+ ABIES SACHALINENSIS 11F + ACER NEGUNDO 11C + UF SAKHALIN FIR + UF BOXELDER

+ ABIES SIBIRICA 11F + ACER PALMATUM 11F + UF SIBERIAN FIR + UF JAPANESE MAPLE

+ ABIES VENUSTA 11F + ACER PLATANOIDES 11F + UF BRISTLECONE FIR + UF NORWAY MAPLE

a ABNORMALITIES 10 + ACER PSEUDOPLATANUS 11F + UF ANOMALIES + UF PLANETREE MAPLE + ABORTUS-BANG-RING TEST + ACER RUBRUM 11F + USE MILK RING TEST 048 + UF RED MAPLE

1 no

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SUBJECT HEADINGS

xx HEAT TRANSFER ACCELEROMETERS Able Burst x Acce le rati on Integrators A Buster - Jangle Operation xx GAGES AND METERS Abnorma II ties xx T PANS DU CERS A-1 Reactor see Dy sp Iasi a ACCIDENTS see Food Irradiation ABRASION see also Disasters Facil it les see also Erosion see also Reactor Safety A-1 Reactor ( Czechoslovak la ) see a Igo Grinding x Cri ti ca II ty Accidents see Bohun ice Power Reactor, see a Igo Poll shing xx DISASTERS Unit 1 see a Igo Wear xx SAFETY Alta xx EROSION ACCOU NT I NG see Carrier Veseel Reactor xx FRICTION see also SF Materials A 2W xx WEAR Accounti ng see Carrier Vesmel Reactor ABRASIVES Accumulators A3W Absorpt 1 on Cross Sec Hone see Storage Batteries see Carrier Vessel Reactor see Cross Sections ACE CREEK PROS FECT A-286 ( IRON ALLOY) Al3SORP TION SPECTRA (SASKATCHEWAN) K K CHROMIUM ALLOYS ANC see also Atomic Absorption Ace Event SYSTEMS Spectrometry see Plowshare Project xx IRON ALLOYS AND SYSTEMS xx SPECTRA ACE LAKE (SASKATCHEWAN) xx MANGANESE ALLOYS AND ACAN THO CEP HALA ACE LAKE AREA (SASKATCHEWAN) SYSTEMS xx ANIMALS ACE MINE (NORTHWEST TERRITORIES) xx MOLYBDENUM ALLOYS AND ACCELERATION ACENAPHTHENE SYSTEMS see a Iso Vel oci ty ACEN/APHTHENE, 1-MET HORT- xx NICKEL ALLOYS AND SYSTEMS x Dece le ra ti on ACENAPHTHENEQUINONE xx TITANIUM ALLOYS AND xx VELOCITY ACEHAPHTHYLENE SYSTEMS Acceleration Integrators ACENES A-esterase see Acce le roue te rs Aces see Aryl esterase Accelerator-Pul sed Fast Assembly see Elementary Particles A. LINCOLN CLAIM (MONT. ) see Critical Assemblies ACETALDEHYDE x Lincoln Cl Ail.,A. (Mont. ) Accelerator Storage Rings ACETALDEHYDEAMMONIA AARR see Storage Rings x E tha nolo. 1-Ael no- see Argonne Advanced Research Accelerator Ta 17e ts ACET A LDEHYDE, 2-CHLORO- Reactor see Radiation Targets Ace ta ldehyde, Hyd rosy- Ad 132 ACCELERA MR TUBES see Glycol' ldehyde see Carbam ic Ac id,Bita( 2,2- xx POWER SUPPLIES ACETALDEHYDE, .:FIENYL- dimet by1-1- xx TUBES ACET A LDEHYDE, T RI BROM- az ir I dinyl )phosphinyl-, ACCELERATORS x Broma Et hy /4Ester see a Igo Beam Sepe ra for Ace to ldeh yde, Trich Icro- AdAJO MOUNTAINS DISTRICT (UTAH) see a Igo Be ta tron's see Ch lora 1 WOMEN see also Brookhaven ACETALDEHYDE, TRIFLUORO- see al so Per itonean Synchrotron x F luora 1 ABDOMINAL VISCERA see a Igo Cal ut ron s ACETALS see al so Bladder see a Igo Cockerel' t-Wal ton x Forma Is see al so Gal lal adder Acce be ra tors ACETAMI DE see also Intestine see a Igo Cycl ot rons see also Di ace ta mide see al so Kidneys see a Igo Electron-Ring x Ace tic Acid, Aside see al so Liver Accelerators Ace tamide, 2,2-Di ch loro-N-( p- see al so Pancreas see a Igo Electrostatic hydroxy-a-(h ydroxyrettyl-p- see al so Spleen Genera tors ni tropheneth yi 3- see al so Stomach see a Iso FFAG Synchrotrons see Ch loramphe ni c al xx VISCERA see a Igo Gravimeters ACETAMIDE, Ng N-DIMETHYL- Abdoun-Ou I an Basin ( Morocco) see lso Li near Accelerators ACETAMI DE, N-ETHYL- see Oul an-Abdoun Basin see a Igo Material s Testing ACEii AMIDE, P4-FLOOREN-2-YL- ( Morocco) Acce le ra tors ACET AMI DE, 2-FLUORO- AdE LINCOLN MINE ( ARIZ.) see a Iso Plasma Accelerator s AMAMI DE, 2-1EDO- ABERDEEN FAST PULSE REACTOR see also Storage Rings ACETAMI DE, 2-MERCAPTO-N-2- FACT LITT see also Synchrocyclotrons NAPHTHYL7 x APRF see also Synchrotrons x Thi ona Ilde x Army Pul se Radiation see a Igoan de Graaff Ace tamide, N-12-(5-Plethoxyl ndol- Foci 1 ity ; Aberdeen ) Acce le ra tors 3-yl )ethyl]- xx REACTORS, FAST x Heavy Particle ace Melia ton) n xx REACTORS, TEST Acce le ra t ors ACETAMI DE, N-METHYL- ASIQUIN DISTRICT ( N. MEX. ) X Particle Accelerators ACETAMIDE, THIC- /MATT ON xx GRAVIMETERS ACETA MI DE, T RI CHLORO- ( Non-surgical ) xx STORAGE RINGS ACETAMI DE, 2,2 ,2-T RIFLUORO- -29-

30 THESAURUS OF EDUCATION TERMS

ACADEMIC STANDARDS LEARNING RATES RT 3001 REMEDIAL TEACHING, ACCREDITATIONP SCHOLASTIC PRORATION* ADMISSI0H SCORE,

ACADEMIC SUCCESS ACHIEVEMENT TEST USE ACHIEVEMENT UF EDUCATIONAL TEST RT 2002 ACCELERATION ACHIEVEMENT* SN THE PROCFSS OF PROGRESSING THROUGH THE SCHOOL GRADES AT A RATE EASIER ACHROMATIC COLOR THAN THAT OF THE AVERAGE CHILD UF BLACK AND WHITE UF SKIPPING RT 9003 FIT 6004 ADVANCED PLACEMENT PROGRAM, ACOUSTICS RATE SN SOUND AFFECTING QUALITIES OF A ROOM PT 9004 ACCENTUATION SN SPEECH ADAPTABILITY RT 9004 /IT 7003 SPEAKING SOCIALIZATION ACCEPTANCE ADDICTION SN GENERAL ATTITUDE OF ONE PERSON TOWARD RT 6001 ANOTHER DRUGS, RT 7003 JUVENILE DELINDUENCY MENTAL HEALTH ACCIDENT SN ADDITION /IT 6001 SN ARITHMETICAL CALCULATION ACCIDENT PREVENTION* RT 17005 TRAFFIC SAFETY* ADEQUACY ACCIDENT INSURANCE SN OF AMOUNT OF SUPPLIES OR STAFF RT 13001 UF INSUFFICIENCY SUFFICIENCY ACCIDENT PREVENTION RT 3002 RT 2007 ABILITY ACCIDENT* ACHIEVEMENT SCHOOL INJURY, FEELING OF INADEQUACY

ACCIDENTAL ERROR ADJECTIVES SN UNPREDICTABLE DEPARTURE FROM THE TRUE RT 16001 VALUE RT 6005 ADJUSTMENT MEASUREMENTS* SN RT 2021 ACCOMPLISHMENT SOCIAL ADJUSTMENT USE ACHIEVEMENT ADMINISTRATING ACCOUNTANT SN RT 1006 UF COORDINATING MANAGING ACCOUNTING RT 2007 RT 17006 DECISION MAKING* TEACHER ADMINISTRATION RELATIONS ACCREDITATION TEST ADMINISTRATION SN OF EDUCATIONAL INSTITUTIONS RT 2007 ADMISSION ACADEMIC STANDARDS* SN ADMITTANCE TO A SCHOOL UF ENTRANCE ACCULTURATION MATRICULATION USE CULTURAL ASSIMILATION NT EARLY ADMISSION RT 2010 ACCURACY ACADEMIC STANDARDS* UF CORRECTNESS ADMISSION TEST* PRECISION FIT 6003 ADMISSION TEST CLARITY RT 2002 CONSISTENCY* ADMISSION* ERROR ADOLESCENCE ACKWYENENT SN AGE TWELVE TO TWENTY ONE UF ACADEMIC IMPROVEMENT UF TEEN AGE ACADEMIC SUCCESS NT EARLY ADOLESCENCE ACCOMPLISHMENT LATE ADOLESCENCE ATTAINMENT MID ADOLESCENCE IMPROVEMENT RT 8009 PERFORMANCE NT OVERACHIEVEMENT ADOPTION UNDERACHIEVEMENT USE LEGAL ADOPTION RT 6004 ACHIEVEMENT TEST* COURSE COMPLETION* se- L`38-30-

'e.r.T.;RARCHICAL INDEX Antennas

Amides (Con.) Hyoscyamine .... Lyapunov functions .. Thioureas .. Scopolamine ... Van der Pol differentialequation , fibrinolysin . Triethylenomelamine .. Ordinary differential equations , Urea . Unsymmetrical dimathylhydrazine .. . Duffings differential equation ... Sturm-Liouville theory Amines Ammonium compounds .. Van der Pot differential equation , Acyclic amines Aluminum ammonium sulfate ... Partial differential equation/ Diethylamine . Ammonium halides .. Boundary value problems .. Dimethylamine . Ammonium hydroxide Cauchy problem .. Ethanolamine Ammonium nitrate Dirichlet problem . Ethylamine . Ammonium perchiorate Potential theory . Methylamine . Ammonium sulfate .. Elliptic differential equations . Amidines . Quaternary ammonium salts .... Hyperbolic differentialequations .Aralkytamines . Tetramethyl ammonium salts .... Parabolic differential equations Benzylamine . Fourier analysis . Diethylpropion Amphibious operations .. Fourier integrals Dopamine . Amphibious demonstrations ... Fourier series . Epinephrine .. Diversionary landings ... Periodic functions Mephentermine . Amphibious raids . Generalized functions . Methylene blue . Amphibious withdrawals .. Delta function . Norepinephrine . Measure and integration . Phenoxybenzamine Analysis (mathematics) .. Discontinuity (mathematic.) Trimethobsnzamids . Complex variables ... Ergodic theory . Tyramine . Analytic continuation .. Integral calculus Arylamines .. Analytic functions ... Convergent integrals . Anilines ... Entire functions .. . . Divergent integrals . Oxophenarsiee .. Cauchy integral formula .. Weighting functions . Sulfanilamide .. Conformal mapping .. Sulfaniiic acid .. Meromorphic functions Analyzers .. Toluidines ... Elliptic functions . Electric analyzers . Diphenylamine ... Rational functions .. Frequency analyzers . Methylene blue ... Zeta function ... Harmonic analyzers . Phentolamine .. Riemann surfaces .. Interference analyzers . Phenylenediamines .. Special functions .. Network analyzers Catecholamines ... Airy function .. Noise analyzers Dopamine .. Besse! functions .. Pulse analyzers . Epinephrine ... Hankel functions ... Pulse height analyzers . Norepinephrine .. Beta function .. Wave analyzers . Fluoroamines . . Exponential functions . Electrostatic analyzers . Heterocyclic amines ... Gamma function .. Ion traps (instrumentation) . Hexamethylenetetramine ... Harmonic functions . Sound analyzers . Physostigmine ... Hyperbolic functions . Spectrum analyzers . Pipe /dines .. Hypergeometric functions .. Meperidine ... Laguerre functions Anhydrides .. Mepivacaine .. Legendre functions . Carboxylic acid anhydrides .. Methylphenidate ... Logarithm functions .. Acetic anhydride .. Pipradrol ... Mathieu functions .. Benzoic anhydride .. Thalidomide ... Orthogonal functions .. Trihexylphenidyl ... Spherical harmonics Antennas . Tropanes . Functional analysis . Aircraft antennas .. Atropine .. Banach space . Beacon antennas .. Cocaine ... Banach algebras . Broadband antennas .. Hyoscyamine ... Hilbert space . Biconicat antennas .. Scopolamine .. Functionals .. Discone antennas . Mstamines .. Generating functions .. Conical antennas Nitramines .. Harmonic analysis . Cylindrical antennas . Polyamines ... Almost periodic functions .. Log periodic antennas .. DIsminos .. Integral equations . Rhombic antennas ... EDTA ... Fredholm equations . Spiral antennas ... Ethylenediamine ... Singular integral equations .. Traveling wave antennas .. Guanidine@ ... Volterra equations . Cassegrain antennas .... Guanethidlne ... Wiener -Hopi equations . Circular antennas .... Guanidine nitrates .. Integral transformations . Coupled antennas .. Phenylenediamines ... Besse! transformation . Dipole antennas . Hexamethylenetetramine ... Convolution integrals .. Cylindrical antennas . Primary amines ... Fourier transformation .. Sleeve antennas . Anilines ... Hankel transformation . Directional antennas .. Oxophenarsino ... Laplace transformation .. Adcock antennas . Sulfanilamide . Real variables .. Backfire antennas ... Sulfanilic acid .. Calculus .. Corner reflector antennas . Toluidines ... Bounded functions .. Helical antennas .. Cycloserine ... Continuity (mathematics) .. Horn antennas .. Dopamine ... Differential calculus .. Lens antennas . Ethanolamine ... Inflection points (mathematics) .. Luneberg lenses .. Ethylsmine .. Integral calculus .. Log periodic antennas .. Ethylenedian ,f a .... Convergent integrals .. Loop antennas .. Methylamint. . .. Divergent integrals .. Parabolic antennas .. Norepinephrine ... Limits (mathematics) .. Nutating antennas .. Phenylenediamines ... Monotone functions . Radar antennas . Pyrrolidines ... Sequences (mathematics) .. Nutating antennas . Physostigmine ... Series (mathematics) .. Rhombic antennas .. Poldine ... Convergent series .. Slot antennas . Quinacrine .... Dirichlet series .. Stowable antennas . Secondary amines .. Divergent series Synthetic aperture antennas .. Diethylamine Asymptotic swiss .. Traveling wave antennas .. Dimethylamine .... Expansions (mathematics) .. Yagi antennas .. Diphenylamine .... Fourier series . Growd vehicle antennas .. Epinephrine .. . Power series . Leaky wave antennas .. Mephentermine Taylors series . Long wire antennas . Tertiary amines Maclaurin series . Microwave antennas .. Aminopyrine . Vector analysis .. Horn antennas .. Amodiaquine ... Curl (vectors) .. Lens antennas .. Chlorisondamine .... Parametricequations ... Luneberg lenses .. Diethylpropion .. Calculus of variations .. Slot antennas .. Methylene blue .. Differential equations . Missile' antennas .. Trimethobenzamfde ... Greens function . Multiple beam antennas .. Tropanes ... L!near differential equations . Navigational antennas .. Atropine ... Nonlinear differential equations .. Direction finding antennas . Cocaine . .. Duffings differential equation ... Wullenweber antennas 627 , NASA THESAURUS (OkKARCHICAL DISPLAY) Ft1 ACIDS -31-

ABNORMALITIES MAGNITIC ANOMALIES GECMAGNETIC HOLLOW

ACCUMULATORS OUST COLLECTORS SOLAR COLLECTORS SOLAR REFLECTORS

ACIDS AMINO ACIDS ADENINES ALANINE ASPARTIC ACID COENZYMES CYSTEINE FOLIC ACID GLUTAMIC ACID GLUTAMINE GLUTATHIONE GLYCINE HIPPURIC ACID HISTIOINE LEUC INE LYSINE MELANDIOIN METHIDNINE NUCLEASE PAPAIN PEPTIDES HYPERTENSIN PHENYLALANINE PROTOPROTEINS PYRIDINE NUCLEOTIDES THYROXINE TRYPTDPHAN URIDYLIC ACID AMOBARBITAL ASCORBIC ACID BORIC ACIDS BUTYRIC ACID CARBONIC ACID CARBOXYLIC ACIDS ACETIC ACID ETHYLENEDIAMINETETRAACETIC ACIDS VERSENE IDODACETIC ACID ACETYLSALICYLIC ACID ACRYLIC ACID ALANINE ASPARTIC ACID BENZILIC ACID BENZOIC ACID CITRIC ACID DICARBOXYLIC ACIDS TEREPHTHALATE FOLIC ACID FORMHYDROXAMIC ACID FORMIC ACID HEXDGENES (TRADEMARK) LACTIC ACID LYSINE NICOTINIC ACID OLEIC ACID OXALIC ACID OXAMIC ACIDS ACIO '.111AIIC ACID IMYVIHPHAN VAIINIC ACID CHIMMIC ACID CYANUItIC ACID CY110Y1 IC ACIb AMU FAIIY MAD!, IUDDACEIIC ACID LIPDIC ACID OLEIC ACID PRI:WIC/NIG ACID SEBACIC ACID VALERIC ACID VERSENE HYDRAZDIC ACID HYDROCHLORIC ACID HYDROFLUORIC 'ACID NITRIC ACID NUCLEIC ACIDS A I ft

ACIDS -32-NASA THESAURUS (HIERARCHICAL DISPLAY) ICON*1)

RIliONOCII IC ACIDS AOININIS URIOYLIC ACIO OXIDASE PERCHLORIC ACIO PHOSPHORIC ACID SULFURIC ACID THYMIOINE THYMINE URIC ACID

ACOUSTIC PROPERTIES ACOUSTIC IMPEDANCE ACOUSTIC INSTABILITY ACOUSTIC SCATTERING REVERBERATION ACOUSTIC VELOCITY SOUNO INTENSITY ZERO SOUND

ACTINIDE SERIES COMPOUNDS PLUTONIUM COMPOUNDS PLUTONIUM FLUORIDES PLUTONIUM OXIDES THORIUM COMPOUNDS THORIUM fLUORIDES THORIUM OXIDES URANIUM COMPOUNDS URANIUM CARBIDES URANIUM FLUORIDES URANIUM OXIDES

ACUITY VISUAL ACUITY HYPEROPIA

ADAPTATION ACCLIMATIZATION ALTITUDE ACCLIMATIZATION COLO ACCLIMATIZATION DESERT ADAPTATION RETINAL ADAPTATION DARK ADAPTATION LIGHT ADAPTATION

ADDITIVES ADMIXTURES ANTIFREEZES ANTIICING ADDITIVES ANTIKNOCK ADDITIVES ANTIOXIOANTS OIL ADDITIVES OPACIFIERS PLASTICIZERS PROPELLANT ADDITIVES PROPELLANT BINDERS SOLID ROCKET BINDERS

AERODYNAMIC CHARACTERISTICS AERODYNAMIC BALANCE AERODYNAMIC DRAG SUPERSONIC DRAG AERODYNAMIC STABILITY LIFT INTERFERENCE LIFT JET LIFT ROTOR LIFT ZERO LIFT STATIC AERODYNAMIC CHARACTERISTICS

AERODYNAMIC FORCES AEROOYNAMIC ORAG SUPERSONIC DRAG AERODYNAMIC LOADS BLAST LOADS GUST LOADS WING LOADING HYPERSONIC FORCES LIFT INTERFERENCE LIFT JET LIFT ROTOR LIFT

A- 2 6 b"lreof--:4-71 -33-

PERMUTED INDEX Isotopes Intestinal (Con.) Iodine organic compounds Aluminum iron hardeners Isocyanides Intestinal obstructions lodo Angle iron Isoindoles Intestine Iodo compounds Cast iron Isoindolines Small intestine diseases lodoalkanes Channel iron Isolation Intestines lodolorm Delta iron Isolators Adhesions (intsstines) lodohydrocarbons Ductile iron Shock isolators Appendix (intestines) bodometallates Ductile iron castings Vibration isolators Colon (intestines) Potassium lodometallates Gamma iron Isoleucine Intoxication Ion Gray iron Isomerases Compressed air intoxication Exchangers (ion) Gray iron castings Isomeric Water intoxication Hydrogen ion activity Iron alloys Isomeric transitions Intracellular Hydrogen ion concentration Iron and steel Industry Isomerism Intracellular potential Ion accelerators Iron carbides Molecular isomerism Intracranial Ion beams Iron castings Isomerization Intracranial electroencephelography Ion bombardment Iron chlorides Isomers "Ion chambers Iron containing alloys Isomers (nuclear) Intramuscular csa concentration (density) Iron cyanides Nuclear isomers Intramuscular infusions Ion currents Iron deficiency anemia isomorphisms Intrastate Ion density (concentration) Iron foundries Isonlazid Intrastate transportation Ion emission Iron halides 'IsonkotinamIdes Intravenous Ion engines Iron inorganic compounds Isonitriles Intravenous infusions Ion exchange membrane electrolytes Iron intermetallics Isopentane Intrinsic Ion exchange resins Iron isotopes lsophthalic Intrinsic viscosity Ion exchangers Iron nitrates Isophthalic acid Intrusion Ion exchanging Iron ore deposits Isopleths Igneous intrusion Ion excretion Iron ores Isoprene Salt water intrusion Ion guns Iron organic compounds lsopropoxide Sea water intrusion Ion irradiation Iran oxides Aluminum isopropoxide Intrusive Ion microscopes Iron powder Isopropyl Intrusive rocks Ion propulsion Iron rich Permalloy® Isopropyl benzene IntussusceptIon Ion pumps Iron sulfate Isoptera lnulin Ion sources Iron sulfides Isoquinolines lnvar® Ion thrustors Malleable cast iron lsospin Invariance Ion traps (Instrumentation) Malleable iron lsostasy Inventions Ion vacuum gages Malleable iron castings lsostatic Inventories Ionic Mottled iron iscstatic change Authorized inventories Ionic conductivity Nodular iron Isostatic pressing Required inventories Ionic crystals Pig iron Isothermal Stores (inventories) Ionic mobility Spheroidal iron Isothermal annealing Inventory Ionic regulation (physiology) Sponge iron Isothermal transformation Inventory control Ionization Tramp iron Isothermal treatment Inventory models Gas ionization Uranium iron alloys Isotherms Inverse Ionization chambers White iron Isothiocyanatas Inverse matrices Ionization coefficients White iron castings Isothionicotinamides Inverse segregation "Ionization counters Wrought iron Isothiuronium Inversions Ionization gages Yttrium iron gamete Isothiuronium compounds Heat inversions Ionization potentials Irons Isotope Inversions (temperature) Meteoric ionization Electric irons Cascades (isotope separation) Temperature inversions Ionized Soldering irons Chemical exchange isotope Invertebrate Diazo compounds (ionized) Waffle irons separation Invertebrate paleontology Ionized gases Irradiance Electromagnetic isotope separation Invertebrates Ionizing Irrediance meters Isotope availability Inverted Ionizing radiation Irradiated Isotope effect Inverted siphons lone grams 3rradiated foods Isotope exchange Inverter lonosondes Irradiation Isotope impurities Inverter circuits Ionosphere Alpha irradiation Isotope separation Inverters Topside ionosphere Bombardment (irradiation) Isotope shift DC to AC inverters Ionospheric Deuteron irradiation Isotopes Static inverters Ionospheric absorption Electron irradiation Actinium isotopes Investigations Ionospheric disturbances Food irradiation Aluminum isotopes Accident investigations Ionospheric probes Gamma irradiation Americium isotopes Criminal investigations Ionospheric propagation Ion irradiation Antimony isotopes Field investigations Ionospheric storms Neutron irradiation Argon isotopes Foundation investigations Sudden ionospheric disturbances Partial body irradiation Arsenic isotopes Geologic investigations lonospherks Proton irradiation Astatine isotopes Seismic investigations Ions Whole body irradiation Barium Isotopes 'Soil investigations Carbonium ions X ray irradiation Berkelium isotopes Subsurface investigations Complex ions Irregularities Beryllium isotopes Investment Hydrogen ions Irrelevance Bismuth isotopes Capital investment Negative ions Irreversible Boron isotopes Fixed investment Organic ions Irreversible processes Bromine isotopes Investment casting Positive ions Irrigated Cadmium isotopes Investment castings IPL Irrigated land Calcium isotopes Permanent investment IPL (programming language) Irrigation Californium isotopes Return on investment Ipronlazld Irrigation canals Carbon isotopes Investments IR Irrigation pipes Cerium isotopes Investors IR drop Sprinkler irrigation Cesium isotopes investors method Iranian Subsurface irrigation Chlorine isotopes Inviscid Iranian languages Surface irrigation Chromium isotopes Inviscid flow Irasers bohemia Cobalt isotopes Involute IFIBM Ischium Copper isotopes Involute gear teeth Irdomes Isentroplc Curium isotopes Iodates Iridium Isentropic flow Dysprosium isotopes Iodide Iridium alloys Islands Einsteinium isotopes Hydrogen iodide Iridium containing alloys Ice islands Erbium isotopes Silver iodide Iridium halides Islands (landforms) Europium isotopes Iodides Iridium inorganic compounds 'Traffic islands Fermium isotopes Potassium iodides Iridium intermetallics Isoamyl Fluorine isotopes Sodium iodides Iridium isotopes Isoamyl acetate Francium isotopes Iodination Iridium organic compounds Isobars Gadolinium isotopes Iodine Iridocyclitis Isobars (pressure) Gallium isotopes Iodine 131 Iris Nuclear isobars Germanium isotopes Iodine aliphatic compounds Iris (anatomy) Isobutane Gold isotopes Iodine aromatic compounds Irises Isobutylene Hafnium isotopes Iodine cycle Irises (mechanical apertures) Isocyanate Helium isotopes Iodine halides labs lsocyanate resins Holmium isotopes Iodine inorganic compounds Iron Isocyanates Hydrogen isotopes Iodine isotopes Alloy cast iron Isocyanic Indium isotopes Iodine number Alpha iron Isocyanic acid Iodine isotopes. Single word terms that appear as descriptors in the Thesaurus of Terms Section are In bold italics; () indicates USE reference. 497 ACOUSTIC NASA THESAURUS (PERMUTED INDEX)

ACOUSTIC ADIABATIC EQUATIONS ACOUSTIC ATTENUATION ADIABATIC FLOW ACOUSTIC ADIPOSE ACOUSTIC DELAY LINES ADIPOSE TISSUES ACOUSTIC DUCTS ADIPRENE ACOUSTIC EXCITATION ADIPRENE (TRADEMARK) ACOUSTIC FATIGUE ADP ACOUSTIC IMPEDANCE ADENOSINE DIPHOSPHATE (ADP) ACOUSTIC INSTABILITY ADRENAL ACOUSTIC MEASUREMENTS ADRENAL GLAND ACOUSTIC NOZZLES ADRENAL METABOLISM ACOUSTIC PROPAGATION ADRENOCORTICOTROPIN ACOUSTIC PROPERTIES ADRENOCORTICOTROPIN (ACTH) ACOUSTIC SCATTERING AOSORPTION ACOUSTIC SIMULATION GIBBS ADSORPTION EQUATION ACOUSTIC STREAMING ADVANCED ACOUSTIC VELOCITY ADVANCED RANGE INSTRUMENTATION SHIP COHERENT ACOUSTIC RADIATION ADVANCED SODIUM COOLED REACTOR ACOUSTICS ADVANCED TEST REACTORS UNOERWATER ACOUSTICS ADVANCED VIOICOA CAMERA SYSTEM (AVCS) ACQUISITION ADVENT OATA ACQUISITION AOVENT PROJECT TARGET ACQUISITION AEOLIAN ACRYLIC AEOLIAN TONES ACRYLIC ACIO AERIAL ACRYLIC RESINS AERIAL EXPLOSIONS ACTH AERIAL PHOTOGRAPHY ADRENOCORTICOTPOPIN (ACTHI AERIAL RECONNAISSANCE ACTINIDE AERIAL RUDOERS ACTINIOE SERIES AEROBEE ACTINIOE SERIES COMPOUNDS AEROBEE ROCKET VEHICLE ACTION AERODYNAMIC NONOSCILLATORY ACTION AERODYNAMIC BALANCE ACTIONS AERODYNAMIC BRAKES EVASIVE ACTIONS AERODYNAMIC CHARACTERISTICS INVOLUNTARY ACTIONS AERODYNAMIC COEFFICIENTS ACTIVATION AEROOYNAMIC CONFIGURATIONS ACTIVATION (BIOLOGY) AERODYNAMIC DRAG ACTIVATION ENERGY AERODYNAMIC FORCES NEUTRON ACTIVATION ANALYSIS AERODYNAMIC HEAT TRANSFER ACTIVE AERODYNAMIC dTATING ACTIVE SATELLITES AERODYNAMIC LOADS ACTIVITY AERODYNAMIC NOISE ACTIVITY (BIOLOGY) AERODYNAMIC STABILITY ACTIVITY CYCLES (BIOLOGY) AERODYNAMIC STALLING CATALYTIC ACTIVITY SPIKES (AEROOYNAMIC CONFIGURATIONS) ENZYME ACTIVITY STATIC AEROOYNAMIC CHARACTERISTICS EXTRAVEHICULAR ACTIVITY AERODYNAMICS SOLAR ACTIVITY ROTOR AEROOYNAMICS SOLAR ACTIVITY EFFECTS AERONAUTICAL ACTUATED AERONAUTICAL ENGINEERING PROPELLANT ACTUATED OEVICES AEROS PROPELLANT ACTUATED INSTRUMENTS AEROS SATELLITE ACTUATOR AEROSPACE ACTUATOR DISKS AEROSPACE ENGINEERING ACUITY AEROSPACE ENVIRONMENTS VISUAL ACUITY AEROSPACE INDUSTRY AOAPTATION AEROSPACE MEDICINE OARK AOAPTATION AEROSPACE SCIENCES OESERT AOAPTATION AEROSPACE SYSTEMS LIGHT AOAPTATION AEROSPACE VEHICLES RETINAL AOAPTATION AFFERENT ADAPTIVE AFFERENT NERVOUS SYSTEMS ADAPTIVE CONTROL AFTEREFFECTS AOAPTIVE FILTERS MOTION AFTEREFFECTS SELF AOAPTIVE CONTROL SYSTEMS AFTERGLOW ADDING HELIUM AFTERGLOW AOOING CIRCUITS OXYGEN AFTERGLOW AOOISONS AGE AODISONS OISEASE AGE FACTOR ADOITION RADIOACTIVE AGE DETERMINATION AOOITION RESINS AGENA AOOITION THEOREM AGENA A ROCKET VEHICLE AOOITIVES AGENA B RANGER PROGRAM ANTIICING AOOITIVES AMA B ROCKET VEHICLE ANTIKNOCK ADDITIVES AGENA C ROCKET VEHICLE OIL AOOITIVES AGENA 0 ROCKET VEHICLE PROPELLANT ADOITIVES AGENA ROCKET VEHICLES ADDRESS ATLAS AGENA B LAUNCH VEHICLE PUBLIC ADDRESS SYSTEMS ATLAS AGENA LAUNCH VEHICLES AOENOSINE THOR AGENA LAUNCH VEHICLE AOENOSINE DIPHOSPHATE (ADP) AGENTS AOENOSINE TRIPHOSPHATE (ATP) ACCELERATING AGENTS AOEPT ANTIHYPERTENSIVE AGENTS HONEYWELL ADEPT COMPUTER STABILIZERS (AGENTS) ADHESION AGING ADHESION TESTS AGING (BIOLOGY) ADIABATIC AGING (METALLURGY) ADIABATIC CONDITIONS

C- 2 SUBJECT CATEGORY INDEX 1101 ..rmew.re +1 I 4..1 0903 (Con,) Input impedance Wullenweber antennas Nuclear thermionic converters Synchronous motors integrators Yogi antennas Open cycle END generators Voltage gain intermediate frequency amplifiers Open cycle MHD generators Voltage regulation Laser amplifiers Plasma closed cycle MND generators Wiring Latching relays 0906 Portable thermion': converters Wiring diagrams Leaky wave antennas Telemetry Portable thermoelectric generators Woundrolor induction motors Lens antennas Biotelematry Pulsed power MHD generators Logarithmic amplifiers Decommutators Radiation resistant solar cells Log periodic antennas Electrical telemetry Radioisotope thermoelectric devices 0904 Long wire antennas Mechanical telemetry Regenerative fuel cent Information Theory Loop antennas Radio telemetry Regenerators Coders Low noise amplifiers Telemetering antennas Rotating generators Coding theory Low noise preamplifiers Telematering data Saturable reactors Communication theory Luneberg lenses Telemetering equipment Segmented elements Data transmission Magnetic modulators Telemetering receivers Solar cells Decoders Mercury arc rectifiers Telemetering transmitters Solar energy concentrators Error correction code' Microphones Telemetry Solar generators Error detection codes Mictowave amplifiers Solar reflectors Hollerith code Microwave antennas Spacecraft electric power units information capacity Microwave receivers Standby power generation Information theory Misslic antennas Standby power generators Intelligibility Modems Static inverters Symbols Modulators 1000 Thermal power plants Monopole antennas ThermioniC collectors Multiple beam antennas Nonpropulsive Thrmionic converters 0905 Navigational antennas Thermionlo heat pipes Subsystems Noise generators Energy Conversion Thermoelectric generators Acoustic arrays Nutating antennas Thermophatovoltalc conveners Acoustic delay lines Omnidirectional antennas Tidal power plants AC to DC converters Operational amplifiers turbogansWors Adcock antennas Parabolic antennas 1001 Van de Greiff generators Aircraft antennas Parametric amplifiers Converean Techniques Windmills Amplifiers Phased arrays Diesel electric power generation Antenna amplifiers Piezoelectric transducers Direct electric power generation Antenna arrays Polarized relays Direct energy conversion 1003 Antenna couplers Potential transformer* Electric power generation Energy Storage Antenna feeds Power amplifiers Electrochemical power generation Alkaline batteries Antennas Power distribution lines Gas turbine power generation Battery chargers Antenna scanners Power lines Hydroelectric power generation Battery depolarizers Audio amplifiers Power subtransmissiori lines Magnetite Battery electrodes Autotransformers Power transformers Mobile power generation Battery electrolytes Backfire antennas Power transmission lines Nuclear electric power generation Battery separators Bandpass amplifiers Power transmission towers Precise power generation Battery testers Beacon antennas Preamplifiers Solar power generation Dry cells Biconical antennas Pulse amplifiers Steam electric power generation Electric batteries Broadband amplifiers Pulse generators Thermionic power generation Electrochemical cells Broadband antennas Pulse integrators Thermoelectric energy conversion Energy storage Cascade control Pulse transformers Thermoelectric power generation High rate batteries Cassegrain antennas Pulse transmitters Thermonuclear power generation Lead acid batteries Circuits Push pull amplifiers Tidal power generation Low temperature batteries Circular antennas Radiolrequency amplifiers Uninterruptible power generation Metal sir batteries Class A amplifiers Radloirequency generators Wind power generation Missile batteries Class B amplifiers Radiolrequency power Nickel cadmium batteries Class C amplifiers Ramp response Primary batteries Conical antennas Rectifiers 1002 Radioisotope batteries Constant current transformers Rhombic antennae Power Sources Reserve batteries Copper oxide rectifiers Rocket antennas AC generators Sea water batteries Corner reflector antennae Selenium rectifiers Amplidynes Storage batteries Counterpoises Sense antennas Auxiliary electric power units Thermal batteries Coupled antennas Servoamplifiers Auxiliary power plants Torpedo batteries Crystal vide") receivers Servomotors Bacon fuel cell* Water activated batteries Current amplifiers Ship antennas Biochemical fuel cells Wet cells Currant regulators Signal generators Cascaded elements Currant transformers Sleeve antennas CesiuM thermionic converters Cylindrical antennas Slot antennas Closed cycle END generators DC to DC convertors Spacecraft antennas Closed cycle MHD generators Demodulators Spherical antennas DC generators Dielectric amplifiers Spiral antennas Direct power generators 1100 Differential amplifiers Standing wave indicators Dynamotors Mohair* Wearable antennas Electric generators Materials Dipole antennas Strip transmission lines Electric power plants Direct coupled amplifiers Submarine antennas Electric reactors Directional antennas Surface wave antennas Electrohydrodynamic generators Direction finding antennas Sweep generators Electrohydrodynamic power generation 1101 Discone antennas Switchboards Electrostatic generators Adhesives and Seals Distributed amplifiers Synchro control transformers Energy conversion heat sources Adhesive papers Dry disk rectifiers Synchro differential generators Fossil fuel thermionic converters Adhesives Earphones Synchro differential motors FUG Cal catalysts Adhesive tapes Echo repeaters Synthetic aperture antennas Fug cal electrodes Dopes Electric controllers Tank circuits Fue cal electrolytes Fuel seals Electric converters T antennas Fue cal fuels Gaskets Electroluminescent panels Television antennas Fug cal oxidants Gas seals Electronic display systems Time 'delay relays Fug cel Glass seals Electron tube amplifiers Timing circuits Fug cal separators Glass to metal seats Endfire arrays Transformers Fug conditioning (fuel cells) Glue Feedback amplifiers Transistor amplifiers Hand generators Heat sealing Ferrimagnetic amplifiers Transmission lines Hydroelectric generators Hermetic seals Fluorescent screens Traveling wave antennas Inverters Hydraulic seals Frequency converters Tuned amplifiers Ion exchange membrane electrolytes Joint fillers Frequency dividers Tuners Liquid metal fuel cells Joint sealers Frequency multipliers Turnstile antennas Liquid metal MHD generators Labyrinth seals Frequency synthesisers Underground antennas Magnetoelectric generators Metallic seals Full wave rectifiers Unfurlabie antennas Magnetohydrodynamic generation Oil seals Ground vehicle antennas Video amplifiers Magnetohydrodynamic generators 0 ring seals Half wave rectifiers Voltage amplifiers Magnetos Packing materials Hall generators Voltage dividers Motor generators Packing* (seals) Helical antennas Voltage regulators Motors Plastic seals Horn antennas Waveform generators Nuclear auxiliary power units Plugs Infrared parametric amplifiers Waveguidos Nuclear power plants Pressure senvttive adhesives 593 NASA THESAURUS (LATLQOKY TOO! LISTING? 0102 AERODYNAMICS OF BODIES 0 lc k 4;4I THIRMAL AIRFOIL PROFILES THICKN(SS RATIO AIRFOILS THIN AIRFOILS AIRFRAMUS THIN BODIES ASPECT RATIO THIN PLATES AXES OF ROTATION THIN WALLED SHELLS AXISYMMETRIC BODIES THIN WALLS AXISYMMETRIC FLOW THREE DIMENSIONAL BOUNDARY LAYER BALLAST THRUST BLUFF BODIES THRUST AUGMENTATION BLUNT BODIES THRUST-WEIGHT RATIO °CATTAILS TILTED PROPELLERS BODIES OF REVOLUTION TIP SPEED BODY -WING AND TAIL CONFIGURATIONS TOLLMEIN-SCHLICHTING WAVES BOUNDARY LAYER CONTROL TORSIONAL VIBRATION BOWS TRAILING EDGES BULKHEADS TRAILING-EDGE FLAPS CAMBER TRANSIENT LOADS CASCADES TRANSITION LAYERS CORE FLOW TRANSITION POINTS CURRENTS TRANSONIC FLIGHT CYLINDRICAL BODIES TRANSONIC FLOW DEFLECTORS TRANSONIC FLUTTER DESIGN TRANSONIC SPEED DUCTED BODIES TRAPEZOIDAL TAIL SURFACES ENCKE METHOD TUMBLING MOTION FAIRINGS TURBIDITY FAN IN WING AIRCRAFT TURBULENCE FEEO SYSTEMS TURBULENCE EFFECTS FENCES TURBULENCE METERS FILLETS TURBULENT BOUNDARY LAYER FINNED BODIES TURBULENT FLOW FINS TURBULENT WAKES FLAPS (CONTROL SURFACES) UNCAMBERED WINGS FLARED BODIES UNDAMPED OSCILLATIONS FLEXIBLE BODIES UNIFORM FLOW FOLDING STRUCTURES UNLOADING FOREBODIES UNSTEADY FLOW FRICTION DRAG UPWASH FRICTIONLESS ENVIRONMENTS VARIABLE SWEEP WINGS FROZEN EQUILIBRIUM FLOW VARIABLE THRUST FULL SCALE TESTS VELOCITY FUSELAGES VELOCITY DISTRIBUTION GLIDE LANDINGS VELOCITY ERRORS GLIDE PATHS VELOCITY MEASUREMENT GLIDERS VENTS GUST ALLEVIATORS VIBRATION GUST LOADS VIBRATION EFFECTS HALF CONES VIBRATIONAL STRESS HALPHEN METHOD VIBRATORY LOADS HAMMERHEAD CONFIGURATION VISCOELASTIC CYLINDERS HIGH ASPECT RATIO VISCOUS DRAG HULLS (STRUCTURES) VON KARMAN EQUATION HYPERVELOCITY FLOW VORTEX BREAKDOWN INFINITE SPAN WINGS VORTEX RINGS JOUKOWSKI TRANSFORMATION VORTICES LAMINAR FLOW AIRFOILS WAKES LEADING EDGE SLATS WAVE DRAG LEADING EDGE SWEEP WAVES LEADING EDGES WEDGE FLOW LIFT WEDGES LIFT AUGMENTATION WEIGHT (MASS) LIFT DEVICES WINO (METEOROLOGY) LOW ASPECT RATIO WINO EFFECTS LOW ASPECT RATIO WINGS WIND TUNNEL STABILITY TESTS MASS BALANCE WINOS ALOFT MEMBRANE STRUCTURES WING CAMBER METAL PLATES WING FLOW METHOD TESTS METAL SHELLS WING LOADING MISSILE STRUCTURES WING OSCILLATIONS MONOCOQUE STRUCTURES WING PROFILES MONOPLANES WING SPAN NACELLES WING-FUSELAGE STORES NEWTON-BUSEMANN LAW WOODEN STRUCTURES NOSE CONES YAW NOSE INLETS YAWING MOMENTS OGIVES ZERO ANGLE OF ATTACK PARAWINGS ZERO LIFT PLASTIC AIRCRAFT STRUCTURES POHLHAUSEN METHOD 0102 AERODYNAMICS OF BODIES PORTS ABLATIVE MATERIALS PRESSURE DISTRIBUTION ABLATIVE NOSE CONES PRESSURE REDUCTION AERODYNAMIC BALANCE PROPELLER SLIPSTREAMS AERODYNAMIC CHARACTERISTICS PROTUBERANCES AERODYNAMIC DRAG PYRAMIDAL BODIES AERODYNAMIC LOADS RAMPS AIRCRAFT CONFIGURATIONS RIDGES AIRCRAFT STRUCTURES RIGID MOUNTING AIRFOIL FENCES RIGID WINGS REPRODUCE THISCOPY PERMISSION TO HAS SEENGRANTED RIGHTED MATERIAL SY wenlwalnwaiNIMM.1MweMworN111.01 -37. 1 er Herbert P . 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51(.66 ABSENTEEISM 01.0 ADAPTATION 51(7 ATTACK RATES 51.42 BLOOD PRESSURE 51(48 BIOCLIMATOLOGY 51.43 CELL GROWTH 5K9 EPIDEMIOLOGY IlL54 CELL METABOLISM 15K*70 GENETICS 5L55 DIGESTION 8K71 HEALTH STATISTICS (IL, 56 INGESTION 5K.72 HEMATOLOGY 5L057 INHIBITION 51(.73 BLOOD CHEMISTRY MAO METABOLISM 5K.74 BLOOD GAS ANALYSIS 51.9 PULSE RATE 5K-75 CARBOXYHEMOGLOB1N 51.45 REPRODUCTION 8K76 HEMOGLOBIN INTERACTIONS 5L41 RESPIRATORY FUNCTIONS aK.71 IMMUNOLOGY 51.62 BREATHING BK.78 ANTIBODIES 5163 COMPLIANCE 51(9 ANTIGENS GY.S1 DEPOSITION 51(40 LIFE SPAN GT.911 LUNG CLEARANCE 5K1 MORBIDITY 01.64 OXYGEN CONSUMPTION 5K42 MORTALITY 51.65 PULMONARY FUNCTION 5K43 OCCUPATIONAL HEALTH 51.66 OXYGEN DIFFUSION 51(44 OUTPATIENT VISITS 0167 PULMONARY RESISTANCE OK5 PATHOLOGICAL TECHNIQUES VAS VENTILATION (PULMONARY) 5146 RADIOLOGICAL HEALTH 1111.19 RETENTION 5L411 TISSUE CULTURES 511 SYNERGISM 0K47 TREATMENTS AIDS 0142 THRESHOLDS 51(45 ARTIFICIAL RESPIRATION 111073 TOXIC TOLERANCES OK 49 BREATHING EXERCISES OK90 DIAGNOSIS 5K.91 AUTOPSY e K92 BIOASSAY 5K93 BIOPSY 51(44 SKIN TESTS EIL74 DISEASES E DISORDERSI DRUGS 8:KKK 4.;67 5 RATSANTIDOTES ORONCHODILATORS 5L75 ALLERGIES OK.99 INHALATION THERAPY 5446 ANEMIA 5L.110 MEDICAL FACILITIES OL77 ANOXIA 51.2 PHYSICAL THERAPY 111-79 ASPHYXIATION O L03 RADIOGRAPHY V.71 BERYLLIOSIS 5L4 SURGERY 11L-S0 BLINDNESS 5L45 VETERINARY MEDICINE 511 CANCER 552 URINALYSIS 5162 BRONCHIAL 51.13 LEUKEMIA 51.64 LUNG 1 51.06 ROPY CONSTITUENTS I PARTS 81,5 SKIN fiL4 TRACHEAL T78 CARCINOGENS 51.0 BOOT FLUIDS 511.47 CARDIOVASCULAR DISEASES 51.-06 BONES 51111 ERYTHEMA 51.13 CELLS 51.69 EYE IRRITATION 1,11 4 BLOOD CELLS 51.40 FLUOROSIS GR41 LEUKOCYTES 51.41 HEADACHE 51.17 LYMPHOCYTES 51.92 HEALTH IMPAIRMENT 51-15 CHROMOSOMES 81.93 HYPERSENSITIVITY 814 6 CILIA 51.94 HYPERVENTILATION 51.16 SPERMATOZOA 01.95 HYPDXIA 5149 CIRCULATORY SYSTEM 51.96 INFECTIOUS DISEASES 011 0 BLOOD VESSELS 5L97 LACHRYMATION 814 I HEART 81.96 METAL POISONING B1.19 DIGESTIVE SYSTEM 51.99 MUTATIONS 51.20 ESOPHAGUS G8410 NAUSEA 51.41 INTESTINES G84,01 ORGANIC DISEASES BL -22 LIVER G5,02 RESPIRATORY DISEASES 5123 MOUTH GR03 ADENOVIRUS INFECTIONS 514 STOMACH 65.04 ASTHMA 51.25 ENZYMES GR05 BRONCHITIS BL.46 EPITHELIUM G1I-56 BRONCHOCONSTRICTION 516 EXCRETIONS 68.07 BRONCHOPNEUMONIA 617 EYES G118111 COMMON COLD K GLANDS 0549 COUGH 5129 HISTAMINES SR10 EMPHYSEMA 01.30 HORMONES G511 HAYFEVER 51.31 KIDNEYS U/ INFLUENZA 51.32 LIPIOS LARYNGITIS 513 MEMBRANES G5.14 PLEURISY 8134 NERVOUS SYSTEM GRI5 PNEUMOCONIOSIS GY29 NUCLEIC ACIDS P114 ANTHRACOSIS 51.3 PROTEINS ASBESTOSIS 81.36 AMINO ACIDS 5.72 BYSSINOSIS 5147 RESPIRATORYmum S.54 FARMER'S LUNG 81.31 BRONCHI GR.111 SILICOSIS 51.39 LARYNX CR-16 PNEUMONIA 11.40 LUNGS R.17 PULMONARY EDEMA 111.41 ALVEOLI G1919 TUBERCULOSIS 111.42 NOSTRILS 05.20 STERILIZATION BL -43 SINUSES CR.21 TUMORS 144 TRACHEA 51.45 SKIN 11146 EPITHELIUM 111.-47 TISSUES Flo. 1. Microtheeaurus of air pollution terms; biosciences and medicine

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