Related terms:
hcl
gas
ypres
somme
trench
tear gas
poison gas
gas shells
chlorine
carbon
mustard gas
chloride
safety
chlorine gas
artillery shells
reaction
use of poison gas
chemical warfare
chemical weapons
chemical
world war
weapons of mass destruction
united states
Wikipedia sources:
Phosgene
Poison gas in World War I
Chemical warfare
Bhopal disaster
Chloroform
Polycarbonate
Trench warfare
United Kingdom and weapons of mass destruction
Context for words:
phosgene
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