Gas warfare is particularly powerful as a defensive weapon ... and Lewisite vapor does not penetrate clothing to the same extent that mustard gas does. During the World War one ton of mustard gas ...
A woman inherits a map of a World War I battlefield in France from her ... important conflict and shed light on the origins of gas warfare.
This story originally appeared in the August 2014 issue of National Geographic magazine as "The Hidden World of the Great War ... first mass use of poison gas, air warfare, and tanks.
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