1. U.S. Code of Federal Regulations. Title 30—Mineral Resources; Chapter 1—Mine Safety and Health Administration, Department of Labor; Subchapter N—Metal and Nonmetallic Mine Safety; Part 56, Subpart R, and Part 57, Subpart R; Subchapter O—Coal Mine Safety and Health; Part 75, Subpart O, and Part 77, Subpart O; July 1,1989
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