title: Pneumoconioses among the workers from the metal working enterprises--Plovdiv.
mesh_terms: D002031:Bulgaria; D005260:Female; D006801:Humans; D008297:Male; D008669:Metallurgy; D011009:Pneumoconiosis / Q000000981:diagnostic imaging / Q000453:epidemiology*; D011859:Radiography; D013997:Time Factors