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Photographs concerning labor, housing and social conditions in the United States
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Hamilton Watch Co. Operator vibrates the hairsprings to insure time-keeping qualities of each watch" The New York Public Library Digital Collections. 1900 - 1937. https://digitalcollections.nypl.org/items/510d47d9-a9b6-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Hamilton Watch Co. Operator vibrates the hairsprings to insure time-keeping qualities of each watch" New York Public Library Digital Collections. Accessed January 29, 2025. https://digitalcollections.nypl.org/items/510d47d9-a9b6-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1900 - 1937). Hamilton Watch Co. Operator vibrates the hairsprings to insure time-keeping qualities of each watch Retrieved from https://digitalcollections.nypl.org/items/510d47d9-a9b6-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-a9b6-a3d9-e040-e00a18064a99 | title=
(still image)
Hamilton Watch Co. Operator vibrates the hairsprings to insure time-keeping qualities of each watch, (1900 - 1937)|author=Digital Collections, The New York Public Library |accessdate=January 29, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>