Author
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Gilbert, Francis P.
49
Roehler, Henry W.
47
United States. Bureau of Land Management. Nevada State Office
47
United States. Forest Service. Pacific Northwest Region,
46
Henderson, John R.
45
Planetary Geology and Geophysics Program (U.S.)
45
U.S. Fish and Wildlife Service
45
U.S. Fish and Wildlife Service,
45
United States. Bureau of Land Management. Arizona State Office
45
United States. Forest Service. Southwestern Region
45
Zietz, Isidore, 1919-
45
National Geographic Maps (Firm)
44
Balsley, J. R.
43
Fullerton, David S.
43
Maryland Geological Survey
42
Stover, Carl W.
42
Water Resources Council (U.S.)
42
Massachusetts. Department of Public Works
41
Garver, John B., Jr
40
Nevada Bureau of Mines and Geology
40
United States. Department of Energy
40
Shupe, John F.
39
United States. Bureau of Indian Affairs
39
O'Sullivan, Robert Brett, 1923-
38
United States. Bureau of Land Management. Arizona State Office,
38
Witkind, Irving J. 1917-2008
38
Meuschke, J. L.
37
New York (State). Department of Environmental Conservation
37
State Geological and Natural History Survey of Connecticut
37
United States. Central Intelligence Agency,
37
United States. Bureau of Land Management. New Mexico State Office,
36
United States. Forest Service. Southwestern Region,
36
United States. National Oceanic and Atmospheric Administration
36
Jet Propulsion Laboratory (U.S.)
35
Miller, Todd S.,
35
New Mexico. Bureau of Mines and Mineral Resources
35
United States. Bureau of Land Management. Idaho State Office
35
United States. Soil Conservation Service
35
Geospatial Service and Technology Center (U.S.)
34
Lesure, Frank Gardner, 1927-
34
Rowley, Peter D.
34
Southwest Florida Water Management District (Fla.)
34
United States. Forest Service. Southern Region,
34
Geological Survey of Wyoming
33
United States. Bureau of Land Management. Utah State Office
33
Utah Geological and Mineral Survey
33
Wood, Gordon H. 1919-
33
Davis, Philip A. 1950-
32
Detterman, J. S.
32
Geological Society of America
32
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