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Eliot Blackwelder
Bailey Willis
North American Geology
Bailey Willis Papers: Finding Aid
Charles D. Walcott Collection, 1851-1940 and Undated
GSA TODAY January Vol
Records and History of the United States Geological Survey
CHARLES DOOLITTLE WALCOTT March 31,1850-February 9,1927
Damming Grand Canyon: the 1923 USGS Colorado River Expedition
Karl Taylor Compton 39 by Julius A
Wyoming Geology 1823-1916
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