Regional trends in the work of WHO, 1980-81: 1.
D000349:Africa; D001210:Asia, Southeastern; D003140:Communicable Disease Control; D006285:Health Planning / Q000639:trends*; D006293:Health Promotion; D006801:Humans; D009656:North America; D013020:South America; D014944:World Health Organization / Q000458:organization & administration*