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© The New York Public Library, 2024
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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "American soldiers learning to adjust gas masks under the direction of French instructors." The New York Public Library Digital Collections. 1860 - 1920. https://qa-digitalcollections.nypl.org/items/510d47db-1408-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "American soldiers learning to adjust gas masks under the direction of French instructors." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/510d47db-1408-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). American soldiers learning to adjust gas masks under the direction of French instructors. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47db-1408-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47db-1408-a3d9-e040-e00a18064a99 | title=
(still image)
American soldiers learning to adjust gas masks under the direction of French instructors., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>