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Author/Creator
- United States. Environmental Protection Agency, issuing body11
- United States. Federal Water Pollution Control Administration10
- Great Britain. Water Pollution Research Board8
- United States. Division of Water Supply and Pollution Control8
- Canada. Environment Canada, issuing body7
- International Water Association6
- United States. Environmental Protection Agency. Office of Water6
- Water Pollution Control Federation5
- United States. Environmental Protection Agency4
- United States. Federal Water Quality Administration4
- Water Environment Federation4
- Air and Water Pollution Conference3
- Delaware. Water Pollution Commission3
- Geological Survey (U.S.)3
- Illinois. Environmental Protection Agency3
- International Association on Water Pollution Research3
- International Association on Water Quality3
- Interstate Commission on the Potomac River Basin3
- Michigan. Stream Control Commission3
- Robert A. Taft Sanitary Engineering Center3