UNITED STATES DEPARTMENT OF THE INTERIOR J. A. Krug, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director Bulletin 959 GEOPHYSICAL ABSTRACTS 132-135 JANUARY-DECEMBER 1948 (NUMBERS 9708-10736) BY V. L. SKITSKY AND S. T. VESSELOWSKY UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1949 CONTENTS [The letters in parentheses are those used to designate, the chapters for separate publication] Page- (A) Geophysical Abstracts 132, January—March 1948 (nos. 9708-9961) _ _21 (B) Geophysical Abstracts 133, April—June 1948 (nos. 9962-10212) 287 (C) Geophysical Abstracts 134, July—Septembef 1948 (nos. 10213-10472) 2177 (D) Geophysical Abstracts 135, October—December 1948 (nos. 10473- 10736) 2263; Index, January—December 19482 361 Under Departmental orders, Geophysical Abstracts have been published at. different times by the Bureau of Mines or by the Geological Survey, as noted below: 1-86, May 1929—June 1936, Bureau of Mines, Information Circulars. [Mimeo- graphed.] 87, July—December 1936, Geological Survey, Bulletin 887. 88-91, January—December 1937, Geological Survey, Bulletin 895. 92-95, January—December 1938, Geological Survey, Bulletin 909. 96-99, January—December 1939, Geological Survey, Bulletin 915. 100-103, January—December 1940, Geological Survey, Bulletin 925. 104-107, January—December 1941, Geological Survey, Bulletin 932. 108-111, January—December 1942, Geological Survey, Bulletin 939. 112-127, January 1943—December 1946, Bureau of Mines, Information Circulars. [Mimeographed.] 128-131, January—December 1947, Geological Survey Bulletin 957. 132-135, January—December 1948, Geological Survey Bulletin 959. III CORRECTION (Substitute for table of contents in Bulletin 959--C) CON TEN TS Page Foreword 2 177 0. General geophysical subjects 2178 1. Gravitational methods 2180 2. Magnetic methods2 186 3. Seismic methods 2199 4. Electrical methods 2217 -so 5. Radioactive methods 2221 6. Geothermal methods2 223 7. Geochemical methods2 224 8. Drill-hole methods 2227 9. Unclassified geophysical subjects 2232 10. Related geological subjects 2238 242 11. Technical aids to exploration 2 12. Patents 2246 Index 2 259 section 8 of previous reports NOTE.—For a greater differentiation of contents, is replaced by section 0 and section 9, and the former section 9 is replaced by section 10 and section 11. An additional section on drill-hole methods, section 8, is introduced. II .