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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110 1 ‡aUnited States. ‡bCongress. ‡bHouse. ‡bCommittee on Mines and Mining
245 1 0 ‡aConditions in the copper mines of Michigan. ‡bHearings 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 ...
260 ‡aWashington, ‡bGovt. Print. Off., ‡c1913-
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