Conditions in the Copper Mines of Michigan: Hearings Before a Subcommittee... Sixty-third Congress, Second Session, Pursuant to H. Res. 387, a Resolution Authorizing and Directing the Committee of Mines and Mining to Make an Investigation of Conditions in the Copper Mines of Michigan. Feb. 16 [-25] 1914, Volumes 2-3
U.S. Government Printing Office
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