Mechanical mining in some bituminous coal mines : Progress report / Louis A. Turnbull; Albert L. Toenges

By: Contributor(s): Resource type: Ressourcentyp: GesamtaufnahmeSetLanguage: English Series: Information circular / Bureau of Mines, US Department of the Interior ; ...Volumes: Show volumesPublisher: Pittsburgh, Pa. : US Dep. of the Interior, Bureau of Mines, 19XX-PPN: PPN: 1185892125
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