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Author/Creator
- Geological Survey (U.S.)[remove]21,939
- National Water-Quality Assessment Program (U.S.)517
- U.S. Atomic Energy Commission403
- United States. National Park Service334
- United States. Environmental Protection Agency314
- United States. Bureau of Reclamation265
- United States. Army. Corps of Engineers214
- United States. Bureau of Land Management214
- United States. Department of Energy201
- U.S. Fish and Wildlife Service145
- United States. Agency for International Development132
- Southwest Florida Water Management District (Fla.)124
- United States. National Aeronautics and Space Administration109
- California. State Water Resources Control Board108
- Afghanistan. Department of Geological Survey107
- United States. Bureau of Indian Affairs104
- New York (State). Department of Environmental Conservation99
- New Jersey. Department of Environmental Protection88
- Washington (State). Department of Ecology82
- South Florida Water Management District (Fla.)79