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Date: 2010-07-20 16:08:32 Crandall 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 List Source URL: www.oig.dol.gov Download Document from Source Website File Size: 2,81 MB Share Document on Facebook

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