Letters to the editor: Cigarette smoking and pneumoconiosis among coal miners.
D001061:Appalachian Region; D003032:Coal Mining; D004781:Environmental Exposure; D006801:Humans; D008297:Male; D011009:Pneumoconiosis / Q000453:epidemiology / Q000209:etiology*; D012907:Smoking / Q000150:complications*; D013997:Time Factors