AlexaYates

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http://wwi.lib.byu.edu/index.php/The_Use_of_Poison_Gas

http://en.wikipedia.org/wiki/Geneva_Conventions

http://en.wikipedia.org/wiki/Poison_gas_in_World_War_I

http://en.wikipedia.org/wiki/Technology_during_World_War_I

http://www.spartacus.schoolnet.co.uk/FWWmustard.htm