2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/6749B-134/569; Figure 3 relation of average dust exposure to workers having pneumoconiosis.Date scanned: 2002-06-28.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.A three-dimensional bar graph shows the relationship between dust concentration, years of employment, and workers with pneumoconiosis.Rights management statement available at: http://library.mines.edu/digital/rights.htmlMiners health and hygieneStillImage