Hevosenlantaa lainehtiva NYC 1800-luvulla
Kauraa ja kavioita - Podcast autorstwa Erppa
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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
