 Around the mid-1850s Snow figured out the source of cholera contamination to be the drinking water from the Broad Street pump.The New York Times reviewed "The Ghost Map", stating that there was "a great story here".A review posted in the "International Journal of Epidemiology" was largely favorable, stating that "the single weakness of this book is a bewildering final section which attempts to apply John Snow's work to a long list of contemporary problems.