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 ...

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United States. Congress.
Language(s)
English
Published
Washington, Govt. Print. Off., 1913-
Physical Description
v. 24 cm.
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