Broad Street (latterly Broadwick Street), Soho, with a white silhouette replica of the Broad Street pump identifed by John Snow as a source of cholera-infected water. Photograph.

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Broad Street (latterly Broadwick Street), Soho, with a white silhouette replica of the Broad Street pump identifed by John Snow as a source of cholera-infected water. Photograph. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.