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Date: 2014-07-18 12:10:26Occupational safety and health Mine Safety and Health Administration United States National Mine Health and Safety Academy Dragline excavator Coal mining United States Bureau of Mines Sago Mine disaster Upper Big Branch Mine disaster Mining Safety engineering Safety | Mine Safety and Health Administration (MSHA) - Holmes Safety BulletinsAdd to Reading ListSource URL: www.msha.govDownload Document from Source WebsiteFile Size: 394,46 KBShare Document on Facebook |