Keywords: L-14-04-23-A 312 (13984436281).jpg Assistant Secretary for Mine Safety Joseph Main announces the coal dust rule before an audience of coal miner families and other attendees at National Institute of Occupational Health NIOSH in Monrgantown West Virginia https //www flickr com/photos/usdol/13984436281/ L-14-04-23-A_312 2014-04-23 12 12 https //www flickr com/people/52862363 N07 US Department of Labor 38 893055 -77 014445 source Flickr PD-USGov US Department of Labor https //flickr com/photos/52862363 N07/13984436281 2016-09-06 06 55 44 United States Government Work Uncategorized 2016 December 21 1 |