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.
|Corporate Author:||United States.|
Washington, Govt. print. off., 1914.
Copper mines and mining
Copper mines and mining /
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