Chemical weapons in World War I - Wikipedia
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Mustard Gas
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Chemical weapons in World War I - Wikipedia
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Chemical weapons in World War I | CNN
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Poison Gases in the First World War
Poison gas in World War I
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Mustard gas: a legacy of WWI
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100 Years of Chemical Weapons
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WWI Centenary: The first world war saw the birth of modern chemical weapons, with poison gas and mustard gas spreading terror - YP | South China Morning Post
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World War I Centenary: Chemical Weapons
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Mustard Gas The German Army first used chlorine gas (Mustard gas) cylinders in April 1915 against the French Army at Ypres. Fre
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Defense against Poison Gas, 1915 - Scientific American Blog Network
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WWI Chemical Warfare: Poison Gas & Gas Masks | What Gas was Used in WWI? | Study.com
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Chemical weapons in World War I - Wikipedia
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