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from Brain Pickings

The Ghost Map: Hard Lessons in Epidemiology from Victorian London

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The 200th anniversary of John Snow’s birth on 15th March 2013 provides an occasion to celebrate Snow’s achievements - best known for his work on cholera, for a famous map, and for organizing the removal of a pump handle on Broad Street on 8th September 1854.

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John Snow traced the cholera epidemic a contaminated water pump. He broke it and stopped the outbreak.

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from the Guardian

John Snow's data journalism: the cholera map that changed the world

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from the Guardian

Better than GPS: a history of cartography in 12 amazing maps

Original map by John Snow showing the clusters of cholera cases in the London epidemic of 1854, drawn and lithographed by Charles Cheffins