Author
Geological Survey (U.S.)
2,975
GPO MARCIVE
244
International Geological Congress
129
American Geophysical Union
116
Pennsylvania. Bureau of Topographic and Geologic Survey
116
U.S. Atomic Energy Commission
113
Geological Society of America
100
United States. National Aeronautics and Space Administration
85
United States. National Park Service
77
e-libro, Corp
77
Kentucky Geological Survey
64
SpringerLink (Online service)
56
United States. Army. Corps of Engineers
54
United States. Congress. House
51
United States. Agency for International Development
47
Geological Survey of Canada
45
United States. Bureau of Mines
45
Maryland Geological Survey
40
Decade of North American Geology Project
39
Thornberry, Trista L.
39
National Science Foundation (U.S.)
38
United States. Department of Energy
38
Du Bray, E. A.
37
American Association of Petroleum Geologists
36
Geological Society of London
36
Roehler, Henry W.
36
West Virginia Geological and Economic Survey
33
Miller, Todd S.
32
United States. Bureau of Indian Affairs
32
Afghanistan. Dept. of Geological Survey
31
Sando, William Jasper
31
Oswego County Planning Board
30
Armstrong, Augustus K.
28
California. Division of Mines and Geology
28
Graham, John P. (John Paul)
27
Sargent, Kenneth A.
27
United States. Bureau of Land Management
27
Gilfillan, David
26
Imlay, Ralph W. (Ralph Willard), 1908-1989
26
Lattanzio, Robert
26
Interior Missouri Basin Field Committee
25
KellerLynn, Katie
25
United States. Bureau of Reclamation
25
American Society of Civil Engineers. Geo-Institute
24
Darwin, Charles, 1809-1882
23
Kellogg, Karl S.
23
Miller, Benjamin L. (Benjamin LeRoy), 1874-1944
23
Pitman, Janet K.
23
Tysdal, Russell G.
23
Bedinger, M. S.
22
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