title: Letter: Types of emphysema.
mesh_terms: D003031:Coal; D003032:Coal Mining; D004391:Dust; D006801:Humans; D008168:Lung / Q000032:analysis / Q000473:pathology; D011650:Pulmonary Alveoli / Q000473:pathology; D011656:Pulmonary Emphysema / Q000473:pathology*; D012907:Smoking / Q000150:complications
chemical_list: D003031:Coal; D004391:Dust