John Lea's map of cholera cases on or near Sycamore Street in Cincinnati, Ohio, in 1849.
John Lea (born 27 January 1782, died 3 June 1862, Cincinnati, Ohio[1]) was a lay epidemiologist most noted today for his contribution to understanding the water-borne nature of cholera.[2]
^Find a Grave. [1]. Retrieved on 09 September 2013.