Conditions in the copper mines of Michigan
Subtitle: 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
Publisher: Govt. print. off.
Published: 1914
Place of publication: Washington
Language: eng
Subjects: Copper mines and mining
Notes: Paged continuously.