Other
Do D: Anthrax Vaccine Immunization Program
The Department of Defense provides detailed information about anthrax, including a focus on the anthrax threat of 2001. Content includes a current "situation report," as well as information on the anthrax vaccine.
CNN
Cnn: 10 Things You Need to Know About Anthrax
In an attempt to educate the public during the scare of the anthrax letter attacks in October, 2001, CNN published information on anthrax.
Council of Foreign Relations
Council on Foreign Relations: The Anthrax Letters
History of the anthrax attacks of 2001 in a Q&A format. Very concise and informative. The basics of the attack are covered. Good place to start research.