The Nation's water :
key unanswered questions about the quality of rivers and streams : report to the chairman, Subcommittee on Investigation and Oversight, Committee on Public Works and Transportation, House of Representatives /
United States General Accounting Office.
Washington, D.C. : The Office, 
Water quality management > Water quality management / United States.
Distributed to depository libraries in microfiche.
163 p. :
ill., maps ;
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