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2/1/2010 - Unpublished documents and reportsIn the FY 2008 Appropriation (Public Law 110-161), Congress directed NIOSH to conduct "a study of the recovery of coal pillars through retreat room-and-pillar mining practices in underground coal mines at depths greater than 1,500 ft." This report inclu...
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Content source: National Institute for Occupational Safety and Health, Mining Program