A hospital in Kansas during the Spanish flu epidemic in 1918.
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Wikimedia Public Domain 120722. https://commons.wikimedia.org/wiki/File:Emergency_hospital_during_Influenza_epidemic,_Camp_Funston,_Kansas_-_NCP_1603.jpg. This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author’s life plus 100 years or fewer.