Federal Mine Health and Safety Inspection Amendments of 1949: Hearings Before a Special Subcommittee of the Committee on Education and Labor, House of Representatives, Eighty-first Congress, First Session, on H. R. 3023, a Bill Amending Public Law 49, Seventy-seventh Congress, Providing for the Welfare of Coal Miners and for Other PurposesU.S. Government Printing Office, 1949 - 536 páginas Considers (81) H.R. 3023. |
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