[The incidence of chronic bronchitis in older workers in agriculture].
D000368:Aged; D000382:Agricultural Workers' Diseases / Q000453:epidemiology*; D001991:Bronchitis / Q000453:epidemiology*; D002908:Chronic Disease; D005260:Female; D005859:Germany, East; D006801:Humans; D008297:Male; D008875:Middle Aged
Zur Häufigkeit der chronischen Bronchitis älterer Werktätiger in der Landwirtschaft.