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Author/Creator
- Geological Survey (U.S.)578
- National Water-Quality Assessment Program (U.S.)50
- United States. Department of Energy24
- United States. Environmental Protection Agency21
- New Jersey. Department of Environmental Protection12
- United States. Department of Energy. Nevada Operations Office11
- Puerto Rico Aqueduct and Sewer Authority9
- United States. Bureau of Reclamation9
- United States. National Park Service8
- Sloto, Ronald A.7
- Southwest Florida Water Management District (Fla.)7
- Washington (State). Department of Ecology7
- Anthony, Stephen S.5
- Florida. Department of Environmental Protection5
- Koerkle, Edward H.5
- Minnesota. Department of Natural Resources5
- Mojave Water Agency (Calif.)5
- Pennsylvania. Department of Environmental Protection5
- United States. Army. Corps of Engineers5
- United States. Federal Highway Administration5