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Author/Creator
- Geological Survey (U.S.)4,652
- National Water-Quality Assessment Program (U.S.)256
- United States. Environmental Protection Agency146
- United States. Department of Energy120
- United States. Bureau of Reclamation108
- United States. Bureau of Land Management86
- United States. National Park Service76
- United States. Army. Corps of Engineers64
- Southwest Florida Water Management District (Fla.)59
- Arkansas Soil and Water Conservation Commission49
- New Jersey. Department of Environmental Protection47
- United States. Bureau of Indian Affairs47
- South Florida Water Management District (Fla.)46
- Washington (State). Department of Ecology46
- U.S. Fish and Wildlife Service42
- United States. Department of Energy. Nevada Operations Office39
- New York (State). Department of Environmental Conservation37
- United States. Federal Highway Administration35
- Florida. Department of Environmental Regulation34
- Arkansas Geological Commission29