01343nam 2200349Ka 450 991069640460332120080404080027.0(CKB)5470000002378800(OCoLC)219509262(EXLCZ)99547000000237880020080404d2000 ua 0engtxtrdacontentcrdamediacrrdacarrierUpdate[electronic resource] Roof Monitoring Safety System for underground stone mines[Pittsburgh, PA] :U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health,[2000]2 unnumbered pages digital, PDF fileTechnology news ;no. 481Title from title screen (viewed on Mar. 12, 2008)."Milestones in Mining Safety and Health Technology.""June 2000."Update Mine roof controlUnited StatesEquipment and suppliesMine roof controlEquipment and supplies.Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)GPOGPOBOOK9910696404603321Update2038694UNINA