01681oam 2200433 a 450 991070132740332120120210122317.0(CKB)5470000002417796(OCoLC)775787655(EXLCZ)99547000000241779620120210d2010 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierProcedures for revoking MSHA certifications to take respirable dust samples or to maintain and calibrate approved dust sampling devices[electronic resource][Arlington, Va.] :[U.S. Dept. of Labor, Mine Safety and Health Administration],[2010]1 online resource (8 pages)Program policy letter ;no. P09-V-08Title from title screen (viewed on Feb. 9, 2012)."Effective date 08/12/09.""Expiration date 03/31/2011."Coal mines and miningDust controlUnited StatesMines and mineral resourcesUnited StatesMine dustsUnited StatesMeasurementMine safetyUnited StatesCoal mines and miningDust controlMines and mineral resourcesMine dustsMeasurement.Mine safetyUnited States.Mine Safety and Health Administration.GPOGPOGPOBOOK9910701327403321Procedures for revoking MSHA certifications to take respirable dust samples or to maintain and calibrate approved dust sampling devices3093328UNINA