Source: Snow J. On the Mode of Communication of Cholera, 1855.

This map presents the location of deaths due to cholera during the Broad Street pump outbreak in the Soho region of London in 1854.  It was included as Map 1 in Snow's book. The original map was produced in 1854 by C.F. Cheffins, Lith, Southhampton Buildings, London at a scale of 30 inches to a mile.  Only those residing in the blue shaded region were included in Dr. Snow's analyses. The 1854 map is presented in 9 panels, sized 50-90 K.