U.S. assistance to foreign copper producers and the effects on domestic industries and environmental standards : hearing before the Subcommittee on Mining, Forest Management, and Bonneville Power Administration of the Committee on Interior and Insular Affairs, House of Representatives, Ninety eighth Congress, first session, on U.S. assistance to foreign copper producers and the effects on domestic industries and environmental standards, hearing held in Tucson, Ariz, May 20, 1983.

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