title: Substantiating the impact of John Snow’s  contributions using data deleted during the  1936 reprinting of his original essay On the  Mode of Communication of Cholera.
authors.affiliation: Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada. samantha.hajna@mail.mcgill.ca
authors.forename: Samantha
authors.initials: S
authors.lastname: Hajna
authors.forename: David L
authors.initials: DL
authors.lastname: Buckeridge
authors.forename: James A
authors.initials: JA
authors.lastname: Hanley
mesh_terms: D000846:Anniversaries and Special Events; D035843:Biomedical Research / Q000266:history; D002771:Cholera / Q000453:epidemiology* / Q000266:history / Q000635:transmission; D060766:Drinking Water / Q000382:microbiology; D058872:Epidemics / Q000266:history; D016021:Epidemiologic Studies; D049672:History, 19th Century; D006801:Humans; D008131:London / Q000453:epidemiology; D014881:Water Supply / Q000266:history
chemical_list: D060766:Drinking Water