Conditions in the Coal Mines of Colorado
Hearings Before A Subcommittee of the Committee on Mines and Mining...pursuant to H. Res. 387, A Resolution Authorizing and Directing the Committee...to Make An InvestigationBook - 1914
Publisher: Washington, DC : U. S. Govt. Print. Off., 1914.
Characteristics: v. : plates, maps ; 23 cm.