Based on a dot map Dr. John Snow created, he was able to link the cases of cholera to a specific public water pump.

Name: Based on a dot map Dr. John Snow created, he was able to link the cases of cholera to a specific public water pump.
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Dr. John Snow's dot map of the 1854 cholera outbreak in London showed a concentration of cases around the Broad Street water pump, leading him to conclude that the disease was waterborne and linked to that specific pump.

Based on a Dot Map Dr