01220nam 2200325Ka 450 991069645340332120080307120321.0(CKB)5470000002378307(OCoLC)213094092(EXLCZ)99547000000237830720080307d1997 ua 0engtxtrdacontentcrdamediacrrdacarrierPrototype borehole miner selectively extracts gold from permafrost[electronic resource][Washington, DC] :U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health,[1997]2 unnumbered pages digital, PDF fileTechnology news ;no. 460Title from title screen (viewed on Mar. 7, 2008)."July 1997."Placer miningUnited StatesPlacer miningNational Institute for Occupational Safety and Health.GPOGPOBOOK9910696453403321Prototype borehole miner selectively extracts gold from permafrost3164750UNINA