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The twentieth anniversary of the Clean Water Act : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Second Congress, second session, September 22, 1992
- "20th anniversary of the Clean Water Act"@en
- "The twentieth anniversary of the Clean Water Act : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Second Congress, second session, September 22, 1992"@en
- "The twentieth anniversary of the Clean Water Act hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Second Congress, second session, September 22, 1992"@en