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Chemical weapons in World War I - Wikipedia
Weaponry: Use of Chlorine Gas Cylinders in World War I - HistoryNet
How the Shocking Use of Gas in World War I Led Nations to Ban It
A Brief History of Chemical War - Science History Institute
First Usage of Poison Gas - National WWI Museum and Memorial
How deadly was the poison gas of WW1? - BBC News
How Gas Became A Terror Weapon In The First World War
The Use of Poison Gases in the First World War
Germans introduce poison gas | April 22, 1915 - HISTORY