01367nam 2200349Ka 450 991069659810332120080407102140.0(CKB)5470000002378866(OCoLC)220879071(EXLCZ)99547000000237886620080407d2006 ua 0engtxtrdacontentcrdamediacrrdacarrierA method to characterize risk associated with mine roof conditions[electronic resource][Pittsburgh, PA] :U.S. Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health,[2006]4 unnumbered pages digital, PDF fileTechnology news ;no. 520DHHS (NIOSH) publication ;no. 2007-104Title from title screen (viewed on Mar. 19, 2008)."Milestones in Mining Safety and Health Technology.""October 2006."Mine roof controlUnited StatesMine roof controlPittsburgh Research Laboratory (National Institute for Occupational Safety and Health)GPOGPOBOOK9910696598103321A method to characterize risk associated with mine roof conditions3533617UNINA