Dirty water and cholera.
Drusin
L M
LM
D002359:Cartoons as Topic / Q000266:history*; D002771:Cholera / Q000453:epidemiology / Q000209:etiology / Q000266:history*; D004196:Disease Outbreaks / Q000266:history*; D049672:History, 19th Century; D006801:Humans; D008131:London / Q000453:epidemiology; D014881:Water Supply / Q000266:history*