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Author/Creator
- Geological Survey (U.S.)27
- Fullerton, David S.12
- Richmond, Gerald Martin, 1914-11
- Christiansen, Ann Coe5
- Maps.com (Firm)4
- Ontario Geological Survey3
- Sado, E. V.3
- Bush, Charles A.2
- Colton, Roger B. (Roger Burnham), 1924-2
- Minnesota Geological Survey2
- Montana Bureau of Mines and Geology2
- Moore, David W. (David Warren)2
- Oklahoma Geological Survey2
- University of Michigan. Department of Geological Sciences2
- University of Texas at Austin. Bureau of Economic Geology2
- University of Texas. Bureau of Economic Geology2
- Wermund, E. G.2
- Clark, David W. (David Wayne), 1951-1
- Cole, Elizabeth F.1
- Denne, Jane E.1