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Grippe aviaire: By Eneas De Troya from Mexico City, México (Epidemia de Pánico Uploaded by Hello32020) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Peste:By Textbook of Military Medicine. Washington, DC, US Department of the Army, Office of the Surgeon General, and Borden Institute. 1997:493. Government publication, no copyright on photos. [Public domain], via Wikimedia Commons
Peste 1897: See page for author [CC BY 4.0 (http://creativecommons.org/licenses/by/4.0)], via Wikimedia Commons
Grippe espagnole: By Mainichi Shimbun [Public domain], via Wikimedia Commons
Smog Montréal: By DubyDub2009 (http://www.flickr.com/photos/urbexplo/5176906559) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Smog Le Caire: By Vogrol (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
Smog à Mexico: By Eneas [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0) or CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons