An important bicentenary.
Beaver
M W
MW
D000846:Anniversaries and Special Events; D004739:England; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D012899:Smallpox / Q000266:history*; D012900:Smallpox Vaccine / Q000266:history; D014611:Vaccination / Q000266:history*
D012900:Smallpox Vaccine