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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
World War I Unleashed Chemical Weapons and Changed Modern Warfare
A Brief History of Chemical War - Science History Institute
10 Facts About Gas and Chemical Warfare in World War One
The Rise and Fall (and Rise) of Chemical Weapons
Chemical weapons - Alpha History
War crimes in World War I - Wikipedia
Gas Warfare - 1914-1918-Online