[Research on industrial hygiene in the 20th year of the German Democratic Republic].
D005859:Germany, East; D049673:History, 20th Century; D006801:Humans; D009784:Occupational Diseases / Q000453:epidemiology*; D009787:Occupational Medicine / Q000266:history*; D012106:Research; D014116:Toxicology
Zur arbeitshygienischen Forschung im 20. Jahr der Deutschen Demokratischen Republik.