01271nam 2200361Ka 450 991069675090332120080714093053.0(CKB)5470000002381363(OCoLC)233823983(EXLCZ)99547000000238136320080714d1996 ua 0engtxtrdacontentcrdamediacrrdacarrierUsing ground penetrating radar for roof hazard detection in underground mines[electronic resource] /Gregory M. Molinda ... [and others][Pittsburgh, Pa.] :U.S. Dept. of Energy, Pittsburgh Research Center,[1996]14 pages digital, PDF fileReport of investigations ;9625Title from title screen (viewed on July 11, 2008)."1996."Mine roof controlGround penetrating radarMine roof control.Ground penetrating radar.Molinda G. M(Gregory M.)1399457Pittsburgh Research Center (U.S.)GPOGPOBOOK9910696750903321Using ground penetrating radar for roof hazard detection in underground mines3464671UNINA