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Author/Creator
- SpringerLink (Online service)170
- United States54
- United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Water Resources and Environment38
- United States. Environmental Protection Agency32
- Whitacre, David M.27
- Municipal Environmental Research Laboratory19
- United States. Federal Water Pollution Control Administration17
- United States. Environmental Protection Agency. Office of Research and Development16
- United States. Environmental Protection Agency. Office of Water15
- United States. General Accounting Office14
- United States. Environmental Protection Agency. Region V.12
- International Joint Commission10
- Rudolfs, Willem, 1886-10
- Babbitt, Harold E. (Harold Eaton), b. 18889
- Corfield, W. H. (William Henry), 1843-19039
- United States. Army. Corps of Engineers9
- Waring, George E. (George Edwin), 1833-18989
- Geological Survey (U.S.)8
- Great Britain. Royal Commission on Sewage Disposal8
- United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Environmental Pollution8