October 26, 1977: a day to cherish.
Aronson
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SM
D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D017589:Immunization Programs / Q000266:history; D012899:Smallpox / Q000266:history* / Q000517:prevention & control; D012900:Smallpox Vaccine / Q000266:history*
D012900:Smallpox Vaccine