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Mine Injury and Worktime, Quarterly U.S. Department of Labor R. Alexander Acosta, Secretary of Labor Mine Safety and Health Administration David G. Zatezalo, Assistant Secretary
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Document Date: 2018-05-23 11:06:23
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File Size: 1,31 MB
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Mine Injury and Worktime, Quarterly U.S. Department of Labor R. Alexander Acosta, Secretary of Labor Mine Safety and Health Administration David G. Zatezalo, Assistant Secretary