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https://www.sheffield.ac.uk/nfca/researchandarticles/freakshows
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https://web.archive.org/web/20131220065328/http://isc.temple.edu/neighbor/ds/disabilityrightstimeline.htm
https://www.adl.org/education/resources/backgrounders/disability-rights-movement
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https://adata.org/ada-timeline
http://www.accessiblesociety.org/topics/persasst/instbias.htm
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