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Date: 2010-07-20 16:08:32Crandall Canyon Mine Mine Safety and Health Act Retreat mining Coal mining Coal mine bump United States Department of Labor UtahAmerican Energy Sago Mine disaster Robert E. Murray Mining Mine Safety and Health Administration Safety engineering | Add to Reading ListSource URL: www.oig.dol.govDownload Document from Source WebsiteFile Size: 2,81 MBShare Document on Facebook |