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H12025 "Smoke Screen" set up in front of the trenches so that the enemy
cannot see the movement of troops, N.Y.C.
H12026 Tanks of Liquid Fire. Trench Warfare Exhibition at Van Cortlandt
Park, New York City.
H12027 Machine Gunners barricaded behind a pile of sand bags, New York
City.
H12028 Forming a smoke screen in front of the trenches, New York City.
H12029 Two tanks of chemicals which, when combined, form a very dense
white smoke, New York City.
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