Smallpox
Carson-DeWitt, Rosalyn S. Gale Encyclopedia of Medicine. 1999: 2667. Info-Trac. William Allen White Library, Emporia State University. 10 October 2002.
Mostby's Medical, Nursing, & Allied Health Dicitionary. Ed. 5, 1998: 8119. Info-Trac. William Allen White Library, Emporia State University. 10 October 2002.
Syphilils
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