[Epidemiologic studies of bronchopneumopathies of occupation-induced etiology].
D002031:Bulgaria; D003430:Cross-Sectional Studies; D006801:Humans; D008171:Lung Diseases / Q000453:epidemiology*; D009784:Occupational Diseases / Q000453:epidemiology*
Epidemiologische Untersuchungen über Bronchopneumopathien mit berufsbedingter Atiologie.