Closure of underground copper mines [electronic resource] : hearing before the Subcommittee on Minerals, Materials, and Fuels of the Committee on Interior and Insular Affairs, United States Senate, Ninety-third Congress, second session, to review the Anaconda Company's plans to close its underground copper mines in Butte, Montana, November 25, 1974.
- Washington : U.S. Govt. Print. Off., 1975.
- Government document
iii, 123 p. : ill. ;
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