Understanding medical officers of health.
Francis
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D003140:Communicable Disease Control / Q000266:history; D004739:England; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011634:Public Health / Q000266:history* / Q000331:legislation & jurisprudence; D011635:Public Health Administration / Q000266:history; D012499:Sanitation / Q000266:history / Q000331:legislation & jurisprudence