Conditions in the Copper Mines of Michigan: Hearings Before a Subcommittee of the Committee on Mines and Mining, House of Representatives, Sixty-third Congress, Second Session, Pursuant to H. Res. 387, a Resolution Authorizing and Directing the Committee on Mines and Mining to Make an Investigation of the Conditions in the Copper Mines of Michigan. February 16-21, February 23-25, [March 2, 3, and 4], 1914 ... (Google eBook)

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U.S. Government Printing Office, 1914
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