"United States. Environmental Protection Agency" . . . . . . "Water pollution : poor quality assurance and limited pollutant coverage undermine EPA's control of toxic substances : report to the Chairman, Subcommittee on Superfund, Ocean, and Water Protection, Committee on Environment and Public Works, U.S. Senate"@en . . . . . . . "Poor quality assurance and limited pollutant coverage undermine EPA's control of toxic substances"@en . . . "Water pollution poor quality assurance and limited pollutant coverage undermine EPA's control of toxic substances : report to the Chairman, Subcommittee on Superfund, Ocean, and Water Protection, Committee on Environment and Public Works, U.S. Senate"@en . . . . . . . . . . . . . . . . . "Water pollution poor quality assurance and limited pollutant coverage undermine EPA's control of toxic substances : report to the chairman, Subcommittee on Superfund, Ocean, and Water Protection, Committee on Environment and Public Works, U.S. Senate"@en . . . . .