Figure 1. Snow's map of cholera deaths in the Broad Street area

Snow's first map showed the pump exactly at the corner of Cambridge Street and Broad Street.  The dotted line encloses area closer to Broad Street pump than to any other pump. The dotted line running along Cambridge street is a subdistrict boundary.
Source: Brody H et al. The Lancet 356(9223), 64-68, 2000.
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