Coal Mine Health and Safety: Hearings, Ninety-first Congress, First Session, Volume 4U.S. Government Printing Office, 1969 - 658 halaman |
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accidents adequate asbestosis authorized representative bill bituminous coal black lung Board Bureau of Mines cause Chairman circuit coal dust coal industry Coal Mine Safety coal operators coal workers collieries committee Congress cubic meter danger DENT Director disability disaster disease effective electrical emphysema employees equipment ERLENBORN examination explosion exposure face fatalities Federal Coal feet fire Flammable foreman gassy mines going GOUGH Harlan County HAWKINS hazards health and safety hoses hydraulic ignited inspection inspector Interior legislation machine methane milligrams miners mining industry National Coal Board nongassy particles Pennsylvania percent permissible pneumoconiosis present problem proposed protection PUCINSKI respirable dust rock dust roof Safety Act safety lamp safety standards Secretary Section 209 Short circuit shuttle cars silicosis statement testimony tion Trailing cable underground United Mine Workers ventilation violation West Virginia WOLFORD X-ray