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Current results range from 1913 to 2014

United States. General Accounting Office28
United States. Congress. Senate. Committee on Environment and Public Works25
United States. Environmental Protection Agency18
United States. Congress. House. Committee on Foreign Affairs. Subcommittee on Human Rights and International Organizations9
United States8
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Author corporate affiliation: Environmental Protection Agency, Office of Air Quality Planning and Standards, Research Triangle Park, N.C.1
Includes glossary1
Subject code: BTE1
Subject code: FDBS1
Subject code: RCGE*DU1
Subject code: WODS1
Subject code: WOE1