History of Bioterrorism
Really good resource on the History of Bioterrorism
http://www.dshs.state.tx.us/preparedness/bt_public_history.shtm
Extremely complete on 1900 to 2000:
W. S. Carus, Bioterrorism and Biocrimes The Illicit Use of Biological Agents Since 1900, vol. 1998, no. February. 2001.