KIRJALLISUUS
Joel Tarr: Urban pollution-many long years ago, American Heritage, Volume 22, issue 6, 1971
https://www.americanheritage.com/
Clay McShanen, Joel Tarr: The Horse in the City: Living Machines in the Nineteenth Century, Johns
Hopkins University Press, Baltimore, 2009
David Doochin: The first global urban planning conference was mostly about manure, 2016
https://www.atlasobscura.com/articles/the-first-global-urban-planning-conference-was-mostly-
about-manure
