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- Geological Survey (U.S.)60
- Maps.com (Firm)23
- NetLibrary, Inc8
- New York (State). Department of Environmental Conservation8
- Southwest Florida Water Management District (Fla.)8
- Reynolds, Richard J.7
- United States. Environmental Protection Agency7
- Ruhl, J. F.6
- United States. Bureau of the Census. Geography Division4
- Wolf, R. J.4
- Adolphson, D. G. (Donald G.), 1928-3
- Beck, Warren A.3
- Casey, George D.3
- Haase, Ynez D.3
- Henderson, S. E.3
- Ardis, Ann F.2
- Arizona. Department of Water Resources2
- Georgia2
- Hammond Incorporated2
- Johnson, Melissa L.2