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Photographs of the construction of the Holland Tunnel, 1919-1927
General Research Division, The New York Public Library. "Contract No. 3. & 4. Full sized section Hudson River vehicular tunnel 29' 6 inches diameter , ...1/19/23, 3:15 p.m." The New York Public Library Digital Collections. 1923. https://qa-digitalcollections.nypl.org/items/510d47da-dc80-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Contract No. 3. & 4. Full sized section Hudson River vehicular tunnel 29' 6 inches diameter , ...1/19/23, 3:15 p.m." New York Public Library Digital Collections. Accessed December 1, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dc80-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1923). Contract No. 3. & 4. Full sized section Hudson River vehicular tunnel 29' 6 inches diameter , ...1/19/23, 3:15 p.m. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dc80-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dc80-a3d9-e040-e00a18064a99 | title=
(still image)
Contract No. 3. & 4. Full sized section Hudson River vehicular tunnel 29' 6 inches diameter , ...1/19/23, 3:15 p.m., (1923)|author=Digital Collections, The New York Public Library |accessdate=December 1, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>