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How the Shocking Use of Gas in World War I Led Nations to Ban It
Chemical weapons in World War I - Wikipedia
How Gas Became A Terror Weapon In The First World War
10 Facts About Gas and Chemical Warfare in World War One
How deadly was the poison gas of WW1? - BBC News
First Usage of Poison Gas - National WWI Museum and Memorial
Gas Warfare - 1914-1918-Online
The horrifying history of gas warfare - Encyclopedia Britannica
Weaponry: Use of Chlorine Gas Cylinders in World War I - HistoryNet
The Use of Poison Gases in the First World War