Colón, Panama, before the sanitary works that were implemented during the construction of the Panama Canal: a ditch runs down the centre of a street lined with wooden houses. Photograph, 1908.

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Colón, Panama, before the sanitary works that were implemented during the construction of the Panama Canal: a ditch runs down the centre of a street lined with wooden houses. Photograph, 1908. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.