<prompt> Pedzisa mutsara unotevera: Panguva yedenda ra1853-54, Farr akaunganidza humwe uchapupu hwezvokuverenga. Mukati mekudzidza kwakananga kwe  <response>: 1854 Kupararira kwekorera muBroad Street, chiremba John Snow akashandisa mashoko akapiwa neGRO 