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Chemical weapons in World War I - Wikipedia
How the Shocking Use of Gas in World War I Led Nations to Ban It
A Brief History of Chemical War - Science History Institute
World War I Unleashed Chemical Weapons and Changed Modern Warfare
First Usage of Poison Gas - National WWI Museum and Memorial
10 Facts About Gas and Chemical Warfare in World War One
Gas in The Great War - University of Kansas Medical Center
The Rise and Fall (and Rise) of Chemical Weapons
The horrifying history of gas warfare - Encyclopedia Britannica
Chemical Warfare and Medical Response During World War I