01222nam 2200361 a 450 991070053760332120110803103410.0(CKB)5470000002410622(OCoLC)744584511(EXLCZ)99547000000241062220110803d2011 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierRun-through check curtains[electronic resource][Arlington, Va.] :[U.S. Dept. of Labor, Mine Safety and Health Administration],[2011]1 online resource (3 pages)Program information bulletin ;no. P11-42Title from title screen (viewed on July 27, 2011)."Issue date 5/20/2011."Coal mines and miningUnited StatesEquipment and suppliesMine safetyUnited StatesCoal mines and miningEquipment and supplies.Mine safetyUnited States.Mine Safety and Health Administration.GPOGPOBOOK9910700537603321Run-through check curtains3213990UNINA