01097nam 2200325Ka 450 991069645920332120080306110412.0(CKB)5470000002378249(OCoLC)212907191(EXLCZ)99547000000237824920080306d1994 ua 0engtxtrdacontentcrdamediacrrdacarrierDesign practices for multiple-seam room-and-pillar mines[electronic resource]Washington, DC :Bureau of Mines, U.S. Dept. of the Interior,[1994]2 unnumbered pages digital, PDF fileTechnology news ;no. 443Title from title screen (viewed on Mar. 6, 2008)."November 1994."Coal mines and miningUnited StatesDesigns and plansCoal mines and miningUnited States.Bureau of Mines.GPOGPOBOOK9910696459203321Design practices for multiple-seam room-and-pillar mines3135196UNINA