01356nam 2200373Ka 450 991069688630332120231024224257.0(CKB)5470000002382015(OCoLC)234382546(EXLCZ)99547000000238201520080722d1972 ua 0engtxtrdacontentcrdamediacrrdacarrierEffect of a surface borehole on longwall gob degasification (Pocahontas No. 3 Coalbed)[electronic resource] /by T.D. Moore and M.G. Zabetakis[Pittsburgh, Pa.?] :U.S. Dept. of the Interior, Bureau of Mines,[1972]9 pages digital, PDF fileReport of investigations ;7657Title from title screen (viewed on July 18, 2008).Effect of a surface borehole on longwall gob degasificationMine ventilationLongwall miningMine ventilation.Longwall mining.Moore T. D1414632Zabetakis Michael G.1924-2005.1431079United States.Bureau of Mines.GPOGPOBOOK9910696886303321Effect of a surface borehole on longwall gob degasification (Pocahontas No. 3 Coalbed)3572286UNINA