![Coal mining / Underground mine ventilation / Mine Safety and Health Act / Luzerne County / Pennsylvania / Sago Mine disaster / Mining / Mine Safety and Health Administration / Safety engineering Coal mining / Underground mine ventilation / Mine Safety and Health Act / Luzerne County / Pennsylvania / Sago Mine disaster / Mining / Mine Safety and Health Administration / Safety engineering](https://www.pdfsearch.io/img/b99d36cdd5cd1a71accdae02e52fe729.jpg) Date: 2014-12-01 11:29:06Coal mining Underground mine ventilation Mine Safety and Health Act Luzerne County Pennsylvania Sago Mine disaster Mining Mine Safety and Health Administration Safety engineering | | [removed]Federal Register / Vol. 79, No[removed]Wednesday, November 26, [removed]Notices been incorporated into numerous public and private sector products and
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