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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. "Contract No. 3 -- Protection Concrete bottom river shaft caisson, N.Y. 12/31/23, 2:15 p.m." The New York Public Library Digital Collections. 1923. https://digitalcollections.nypl.org/items/510d47da-dc5f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Contract No. 3 -- Protection Concrete bottom river shaft caisson, N.Y. 12/31/23, 2:15 p.m." New York Public Library Digital Collections. Accessed April 18, 2024. https://digitalcollections.nypl.org/items/510d47da-dc5f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1923). Contract No. 3 -- Protection Concrete bottom river shaft caisson, N.Y. 12/31/23, 2:15 p.m. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dc5f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dc5f-a3d9-e040-e00a18064a99 | title=
(still image)
Contract No. 3 -- Protection Concrete bottom river shaft caisson, N.Y. 12/31/23, 2:15 p.m., (1923)|author=Digital Collections, The New York Public Library |accessdate=April 18, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>