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- Geological Survey (U.S.)291
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- Adam Matthew Digital (Firm)63
- Great Britain. Colonial Office63
- Maps.com (Firm)54
- Clark, Perry S.53
- Southwest Florida Water Management District (Fla.)19
- Maryland Geological Survey15
- United States. Central Intelligence Agency14
- United States. Bureau of Land Management13
- Mack, Frederick K.12
- Indian Map Service11
- United States. Bureau of the Census. Geography Division11
- Arya, R. P.10
- Busby, John F.10
- Colton, Roger B. (Roger Burnham), 1924-10
- Montana Bureau of Mines and Geology10
- Ortiz, A. G.10
- Pettijohn, Robert A.10
- Brasier, William9