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 Conditions in the Copper Mines of Michigan, Volumes 4-7

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U.S. Government Printing Office, 1914 - Copper mines and mining
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