Coal and the lung.
D003031:Coal / Q000009:adverse effects*; D004391:Dust / Q000009:adverse effects*; D006801:Humans; D008297:Male; D009784:Occupational Diseases / Q000209:etiology*; D011656:Pulmonary Emphysema / Q000209:etiology*
D003031:Coal; D004391:Dust