Author/Creator
- Geological Survey (U.S.)✖[remove]6,060
- National Water-Quality Assessment Program (U.S.)289
- United States. Environmental Protection Agency164
- U.S. Fish and Wildlife Service116
- United States. Department of Energy109
- United States. Bureau of Reclamation101
- United States. Bureau of Land Management95
- United States. National Park Service84
- United States. Army. Corps of Engineers64
- Washington (State). Dept. of Ecology50
- Arkansas Soil and Water Conservation Commission44
- Southwest Florida Water Management District (Fla.)42
- United States. Department of Energy. Nevada Operations Office41
- South Florida Water Management District (Fla.)39
- New Jersey. Dept. of Environmental Protection38
- United States. Bureau of Indian Affairs34
- United States. Federal Highway Administration33
- Wisconsin. Dept. of Natural Resources32
- New York (State). Dept. of Environmental Conservation31
- United States. Bureau of the Census30