01371nam 2200337Ka 450 991069640210332120080404135738.0(CKB)5470000002378825(OCoLC)219716638(EXLCZ)99547000000237882520080404d2002 ua 0engtxtrdacontentcrdamediacrrdacarrierUsing propeller fans to improve ventilation in large-entry stone mines[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,[2002]2 unnumbered pages digital, PDF fileTechnology news ;no. 499Title from title screen (viewed on Mar. 17, 2008)."Milestones in Mining Safety and Health Technology.""December 2002."Mining engineeringHeating and ventilationUnited StatesMining engineeringHeating and ventilationPittsburgh Research Laboratory (National Institute for Occupational Safety and Health)GPOGPOBOOK9910696402103321Using propeller fans to improve ventilation in large-entry stone mines3109878UNINA