Variolation from the Past:
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[20] [21] “Inoculation.” last modified December 24,
2012, <http://www.historyofvaccines.org/>.
[22] "Origins of Vaccination.” last modified December 24, 2012, <http://imammahdiarrival.com/origins_of_vaccination/origins_of_vaccination.html>.
[23] "History of Variolation and Incunabula." last modified December 26, 2012 <http://www.med.yale.edu/library/historical/klebs/3.html>.
[6**] “The History of Vaccines Blog.” last modified November 18, 2012, <http://www.historyofvaccines.org/blog?page=14>.
[22] "Origins of Vaccination.” last modified December 24, 2012, <http://imammahdiarrival.com/origins_of_vaccination/origins_of_vaccination.html>.
[23] "History of Variolation and Incunabula." last modified December 26, 2012 <http://www.med.yale.edu/library/historical/klebs/3.html>.
[6**] “The History of Vaccines Blog.” last modified November 18, 2012, <http://www.historyofvaccines.org/blog?page=14>.