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- Geological Survey (U.S.)46
- Maps.com (Firm)17
- Mack, Frederick K.6
- Maryland Geological Survey6
- Andreasen, David C.4
- Curtin, Stephen E.4
- Maryland. Resource Assessment Administration4
- Schaap, Bryan D.3
- United States. Central Intelligence Agency3
- Alexander, Terry W.2
- Counts, H. B. (Harlan B.)2
- Hester, Willis G.2
- Idaho. Division of Environmental Quality2
- Krause, Richard E.2
- Maupin, Molly A.2
- South Florida Water Management District (Fla.)2
- Survey of India2
- United States. Natural Resources Conservation Service2
- Barron, Andrew D.1
- Bower, David E.1