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.
|Corporate Author:||United States.|
Washington : G.P.O., 1914.
Copper mines and mining
Copper mines and mining /
Copper mines and mining / Michigan /
Hearings held February 9-March 23, 1914.
7 v. ;
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