Contributions to the methodology of epidemiological investigations on pneumoconiosis in a coal-field.
D000328:Adult; D000367:Age Factors; D003032:Coal Mining; D004391:Dust; D004781:Environmental Exposure; D006801:Humans; D008875:Middle Aged; D011009:Pneumoconiosis / Q000453:epidemiology*; D012383:Romania; D013997:Time Factors
D004391:Dust