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Sewer cleaning. Illustration of workers emptying solid waste from a sewer and taking it away in a cart. Image of the sewers in Paris, France, during the early 19th century. In 1806 Paris had 23 kilometres of sewers; by 1863 this had risen to 350 kilometres. Image taken from Hygiene Publique (1836) by A.J.B. Parent-Duchatelet.
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