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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Boulder Dam" The New York Public Library Digital Collections. 1936. https://digitalcollections.nypl.org/items/510d47e4-1ca4-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Boulder Dam" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/510d47e4-1ca4-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1936). Boulder Dam Retrieved from https://digitalcollections.nypl.org/items/510d47e4-1ca4-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e4-1ca4-a3d9-e040-e00a18064a99 | title=
(still image)
Boulder Dam, (1936)
|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>