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Author/Creator
- Geological Survey (U.S.)537
- United States. Environmental Protection Agency24
- National Water-Quality Assessment Program (U.S.)22
- United States. Department of Energy20
- Alabama. Department of Environmental Management13
- United States. National Park Service11
- New Hampshire. Water Resources Division10
- United States. Bureau of Land Management9
- Washington (State). Department of Ecology9
- Chester County Water Resources Authority8
- Gingerich, Stephen B.8
- United States. Bureau of Indian Affairs8
- United States. Bureau of Reclamation8
- New Mexico. State Engineer Office7
- Commonwealth Utilities Corporation (Northern Mariana Islands)6
- Dumouchelle, D. H. (Denise H.)6
- Miller, Todd S.6
- Moore, Richard B., 1953-6
- Northern Mariana Islands6
- Sloto, Ronald A.6