Respirable dust in bituminous coal mines in the U.S.
D003032:Coal Mining; D004391:Dust / Q000032:analysis*; D004864:Equipment and Supplies; D007501:Iron / Q000032:analysis; D008297:Male; D008722:Methods; D012822:Silicon Dioxide / Q000032:analysis; D014481:United States
D004391:Dust; D012822:Silicon Dioxide; D007501:Iron