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- Geological Survey (U.S.)[remove]25,732
- National Water-Quality Assessment Program (U.S.)562
- U.S. Atomic Energy Commission427
- United States. National Park Service352
- United States. Environmental Protection Agency330
- United States. National Aeronautics and Space Administration329
- United States. Bureau of Reclamation271
- United States. Bureau of Land Management236
- United States. Department of Energy224
- United States. Army. Corps of Engineers218
- Planetary Geology Program (U.S.)173
- U.S. Fish and Wildlife Service148
- United States. Agency for International Development144
- Southwest Florida Water Management District (Fla.)126
- United States. Bureau of Indian Affairs122
- California. State Water Resources Control Board110
- Afghanistan. Department of Geological Survey107
- United States. National Oceanic and Atmospheric Administration101
- New York (State). Department of Environmental Conservation99
- New Jersey. Department of Environmental Protection91