John Snow's M.D. University of London, 1844.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: John Snow's M.D. University of London, 1844. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: John Snow's M.D. University of London, 1844. Wellcome Collection. Source: Wellcome Collection.