title: McLetchie on mass campaigns.
mesh_terms: D000349:Africa; D003154:Community Medicine; D004812:Epidemiologic Methods; D049673:History, 20th Century; D006801:Humans; D010819:Physician's Role; D011320:Primary Health Care / Q000379:methods*; D011634:Public Health / Q000266:history; D012424:Rural Population; D014330:Tropical Medicine / Q000266:history; D006113:United Kingdom