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- Geological Survey (U.S.)97
- Maps.com (Firm)30
- New York (State). Department of Environmental Conservation10
- Reynolds, Richard J.9
- NetLibrary, Inc8
- Southwest Florida Water Management District (Fla.)8
- United States. Environmental Protection Agency7
- Ruhl, J. F.6
- New Jersey. Department of Environmental Protection5
- International Publications (Firm : Delhi, India)4
- National Atlas & Thematic Mapping Organisation (India)4
- Scott, Glenn R., 1918-20124
- South Florida Water Management District (Fla.)4
- United States. Bureau of the Census. Geography Division4
- Wolf, R. J.4
- Adolphson, D. G. (Donald G.), 1928-3
- Appalachian Regional Commission3
- Beck, Warren A.3
- Casey, George D.3
- Eicher Goodearth Limited3