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Keywords: US Steel, historical (5911661041).jpg US Steel historical https //www flickr com/photos/niosh/5911661041/ US Steel historical 2011-05-23 10 34 https //www flickr com/people/25069384 N03 National Institute for Occupational Safety and Health NIOSH from USA PD-USGov NIOSH http //flickr com/photos/25069384 N03/5911661041 2015-04-28 04 51 20 United States Government Work Uncategorized 2015 April 28 |