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Author/Creator
- Geological Survey (U.S.)893
- United States. National Park Service48
- Afghanistan. Department of Geological Survey37
- Bohannon, Robert G.27
- Billingsley, George H.19
- United States. Bureau of Land Management17
- Evarts, Russell C.15
- Kellogg, Karl S.15
- Tabor, R. W. (Rowland W.)15
- Turner, Kenzie J.15
- Weary, David J.15
- Wilson, Frederic H., 1950-14
- Colton, Roger B. (Roger Burnham), 1924-13
- Montana Bureau of Mines and Geology13
- Booth, Derek B.12
- Denson, N. M. (Norman MacLaren), 1914-12
- Du Bray, E. A.11
- Fullerton, David S.11
- Thompson, Ren A.11
- Maldonado, Florian10