title: Letter: Coal worker's pneumoconiosis and carcinoma of the lung.
mesh_terms: D003032:Coal Mining; D004739:England; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D011009:Pneumoconiosis / Q000453:epidemiology*; D014852:Wales