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Author/Creator
- Geological Survey (U.S.)208
- Maps.com (Firm)91
- Adam Matthew Digital (Firm)21
- Great Britain. Colonial Office21
- National Archives (Great Britain)21
- Feltis, R. D. (Richard D.), 1930-18
- Folger, Helen W.13
- Yager, Douglas B.13
- California. Division of Mines and Geology11
- United States. Central Intelligence Agency11
- Arizona Water Commission10
- Jenness, Jane E.9
- Lopez, David A.9
- United States. Bureau of the Census. Geography Division9
- Sargent, Kenneth A.7
- University of Arizona. Bureau of Geology and Mineral Technology7
- Bedinger, M. S.6
- Farrar, C. D. (Christopher D.)6
- Langer, William H.6
- Nevada Bureau of Mines and Geology6