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- United States. Environmental Protection Agency. Office of Water Program Operations8
- Center for Environmental Research Information (U.S.)7
- United States. Environmental Protection Agency. Office of Research and Monitoring7
- United States. Environmental Protection Agency. Office of Wastewater Management7
- United States. Environmental Protection Agency. Water Quality Office7
- Waring, George E., Jr. (George Edwin), 1833-18987
- Kinnicutt, Leonard P. (Leonard Parker), 1854-19116
- Metcalf & Eddy6
- Tchobanoglous, George6
- United States. Congress. Senate. Committee on Environment and Public Works6
- United States. Division of Water Supply and Pollution Control6
- ebrary, Inc6
- California. Bureau of Sanitary Engineering5
- Chicago Sanitary District5
- Geological Survey (U.S.), issuing body5
- Rideal, Samuel, 1863-19295
- SCS Engineers5
- Smith, Robert, 1921-5
- Sperling, Marcos von5
- United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Superfund and Environmental Oversight5