01339nam 2200349Ka 450 991069660130332120080404144407.0(CKB)5470000002378833(OCoLC)219729266(EXLCZ)99547000000237883320080404d2004 ua 0engtxtrdacontentcrdamediacrrdacarrierNIOSH safety talk[electronic resource] the emergency communication triangle[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,[2004]2 unnumbered pages digital, PDF fileTechnology news ;no. 507Title from title screen (viewed on Mar. 17, 2008)."Milestones in Mining Safety and Health Technology.""September 2004."NIOSH safety talk Emergency communication systemsUnited StatesEmergency communication systemsPittsburgh Research Laboratory (National Institute for Occupational Safety and Health)GPOGPOBOOK9910696601303321NIOSH safety talk3525395UNINA