Conditions in the Coal Mines of Colorado (Volume 2); Hearings Before a Subcommittee of the Committee on Mines and Mining, Hous of Representatives, Sixty-Third Congress, Second Session, Pursuant to H. Res. 387, a Resolution Authorizing and Directing the Co

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Conditions in the Coal Mines of Colorado (Volume 2); Hearings Before a Subcommittee of the Committee on Mines and Mining, Hous of Representatives, Sixty-Third Congress, Second Session, Pursuant to H. Res. 387, a Resolution Authorizing and Directing the Co - Mining, United States Congress

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