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http://science.howstuffworks.com/biochem-war3.htm - Howstuffworks - Feared chemical agents
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http://science.howstuffworks.com/biochem-war4.htm - Howstuffworks - Feared biological agents
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http://www.defense.gov/specials/chembio/ - Defense.gov - Defending Against Invisible Killers
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http://www.defense.gov/specials/chembio/ - Defense.gov - Defending Against Invisible Killers
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