01198nam 2200325Ka 450 991069682280332120080729074952.0(CKB)5470000002382657(OCoLC)236465419(EXLCZ)99547000000238265720080729d1982 ua 0engtxtrdacontentcrdamediacrrdacarrierProbability of encountering coalbed discontinuities during vertical and horizontal borehole drilling[electronic resource] /by David W. Houseknecht[Pittsburgh, Pa.?] :U.S. Dept. of the Interior, Bureau of Mines,[1982]ii, 21 pages digital, PDF fileReport of investigations ;8665Title from title screen (viewed on July 28, 2008).Coal mines and miningCoal mines and mining.Houseknecht David W1381473United States.Bureau of Mines.GPOGPOBOOK9910696822803321Probability of encountering coalbed discontinuities during vertical and horizontal borehole drilling3548469UNINA