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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "77th Div. in training at Camp Upton, L.I., N.Y. Gas defense drill. At times gas attacks assume such volumes that the entire landscape is all but obscured from view. These attacks often last for 2 or 3 hrs at a time, being governed by the wind. 3-5-1918." The New York Public Library Digital Collections. 1860 - 1920. https://digitalcollections.nypl.org/items/510d47d9-bdfc-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "77th Div. in training at Camp Upton, L.I., N.Y. Gas defense drill. At times gas attacks assume such volumes that the entire landscape is all but obscured from view. These attacks often last for 2 or 3 hrs at a time, being governed by the wind. 3-5-1918." New York Public Library Digital Collections. Accessed February 8, 2025. https://digitalcollections.nypl.org/items/510d47d9-bdfc-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). 77th Div. in training at Camp Upton, L.I., N.Y. Gas defense drill. At times gas attacks assume such volumes that the entire landscape is all but obscured from view. These attacks often last for 2 or 3 hrs at a time, being governed by the wind. 3-5-1918. Retrieved from https://digitalcollections.nypl.org/items/510d47d9-bdfc-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-bdfc-a3d9-e040-e00a18064a99 | title=
(still image)
77th Div. in training at Camp Upton, L.I., N.Y. Gas defense drill. At times gas attacks assume such volumes that the entire landscape is all but obscured from view. These attacks often last for 2 or 3 hrs at a time, being governed by the wind. 3-5-1918., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=February 8, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>