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Author/Creator
- Geological Survey (U.S.)482
- National Water-Quality Assessment Program (U.S.)22
- United States. Environmental Protection Agency15
- United States. Department of Energy13
- United States. Bureau of Reclamation11
- Florida. Department of Environmental Regulation8
- United States. Federal Highway Administration8
- United States. National Park Service7
- Gordon, J. D.6
- Pennsylvania. Department of Environmental Protection6
- United States. Army. Corps of Engineers6
- Bartholomay, Roy C.5
- Berenbrock, Charles5
- Kansas. Department of Health and Environment5
- Medalie, Laura5
- Nassau County (N.Y.). Department of Public Works5
- Ohio. Department of Transportation5
- Southwest Florida Water Management District (Fla.)5
- United States. Bureau of Land Management5
- Washington (State). Department of Ecology5