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© The New York Public Library, 2024
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Photographs of the construction of the Holland Tunnel, 1919-1927
General Research Division, The New York Public Library. "Contracts No. 3 &4. Hundson River vehicular tunnel. 1/20/23, 10:30 p.m." The New York Public Library Digital Collections. 1923. https://digitalcollections.nypl.org/items/510d47da-dc81-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Contracts No. 3 &4. Hundson River vehicular tunnel. 1/20/23, 10:30 p.m." New York Public Library Digital Collections. Accessed April 25, 2024. https://digitalcollections.nypl.org/items/510d47da-dc81-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1923). Contracts No. 3 &4. Hundson River vehicular tunnel. 1/20/23, 10:30 p.m. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dc81-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dc81-a3d9-e040-e00a18064a99 | title=
(still image)
Contracts No. 3 &4. Hundson River vehicular tunnel. 1/20/23, 10:30 p.m., (1923)|author=Digital Collections, The New York Public Library |accessdate=April 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>