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Conditions in the Coal Mines of Colorado: Hearings before a Subcommittee of the Committee on Mines and Mining, House of Representatives, Sixty-Third Congress, Second Session, Part IV [1914]
- Format:
- Book
- Language:
- English
- Other Title:
- Conditions in the Coal Mines of Colorado
- Place of Publication:
- Washington: U.S. G.P.O.,
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