01320nam 2200373Ka 450 991069683220332120080728102458.0(CKB)5470000002382562(OCoLC)236165973(EXLCZ)99547000000238256220080728d1982 ua 0engtxtrdacontentcrdamediacrrdacarrierUnderground gob gas drainage during longwall mining[electronic resource] / Steven J. Schatzel, Gerald L. Finfinger, and Joseph Cervik[Pittsburgh, Pa.?] :U.S. Dept. of the Interior, Bureau of Mines,[1982]14 pages digital, PDF fileReport of investigations ;8644Title from title screen (viewed on July 28, 2008).Longwall miningSafety measuresCoalbed methane drainageLongwall miningSafety measures.Coalbed methane drainage.Schatzel Steven J1395446Finfinger Gerald L1396023Cervik Joseph1389517United States.Bureau of Mines.GPOGPOBOOK9910696832203321Underground gob gas drainage during longwall mining3455415UNINA