John Snow Record of Locations of Cholera Cases in London, 1854

Map: A graphic titled "John Snow Record of Locations of Cholera Cases in London, 1854"

Caption: Map shows the street layout of a London neighborhood, notes the location of 11 water pumps in the area, and plots the location of cholera deaths in the same neighborhood.

Source: Dr. Rita Colwell, Director of The National Science Foundation

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