Dr John Snow.
Blair
J S G
JS
International Society for the History of Medicine.
D002771:Cholera / Q000453:epidemiology / Q000266:history; D004196:Disease Outbreaks / Q000266:history*; D004813:Epidemiology / Q000266:history*; D049672:History, 19th Century; D006801:Humans; D008131:London / Q000453:epidemiology; D011634:Public Health / Q000266:history*