01319nam 2200397Ka 450 991069687810332120080723075849.0(CKB)5470000002382098(OCoLC)234857718(EXLCZ)99547000000238209820080723d1973 ua 0engtxtrdacontentcrdamediacrrdacarrierBleeder system in virgin area in a Pittsburgh coalbed mine[electronic resource] /Stephen Krikovic, T.D. Moore, Jr., and J.E. Carpetta[Pittsburg, Pa.?] :U.S. Dept. of the Interior, Bureau of Mines,[1973]8 pages digital, PDF fileReport of investigations ;7805Title from title screen (viewed on July 22, 2008).Mine gasesMethaneMine ventilationMine gases.Methane.Mine ventilation.Krickovic Stephen1405795Moore T. D1414632Carpetta J. E(John E.)1422330United States.Bureau of Mines.GPOGPOBOOK9910696878103321Bleeder system in virgin area in a Pittsburgh coalbed mine3546280UNINA