01466nam 2200349Ka 450 991069659580332120080407133336.0(CKB)5470000002378889(OCoLC)220922636(EXLCZ)99547000000237888920080407d2001 ua 0engtxtrdacontentcrdamediacrrdacarrierProceedings, new technology for coal mine roof support, Information Circular (IC) 9453[electronic resource][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,[2001]2 unnumbered pages digital, PDF fileTechnology news ;no. 493Title from title screen (viewed on Mar. 14, 2008)."Milestones in Mining Safety and Health Technology.""August 2001."Proceedings, new technology for coal mine roof support, Information Circular Mine roof controlUnited StatesMine roof controlPittsburgh Research Laboratory (National Institute for Occupational Safety and Health)GPOGPOBOOK9910696595803321Proceedings, new technology for coal mine roof support, Information Circular (IC) 94533189166UNINA