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Photographs of the construction of the Holland Tunnel, 1919-1927
General Research Division, The New York Public Library. "Contract No. 4. North Tunnel West shield at Ring No. 312 and cleaning and caulking, N,J. 4/1/25, 1:10 p.m." The New York Public Library Digital Collections. 1925. https://qa-digitalcollections.nypl.org/items/510d47da-dcf0-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Contract No. 4. North Tunnel West shield at Ring No. 312 and cleaning and caulking, N,J. 4/1/25, 1:10 p.m." New York Public Library Digital Collections. Accessed November 29, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dcf0-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1925). Contract No. 4. North Tunnel West shield at Ring No. 312 and cleaning and caulking, N,J. 4/1/25, 1:10 p.m. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dcf0-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dcf0-a3d9-e040-e00a18064a99 | title=
(still image)
Contract No. 4. North Tunnel West shield at Ring No. 312 and cleaning and caulking, N,J. 4/1/25, 1:10 p.m., (1925)|author=Digital Collections, The New York Public Library |accessdate=November 29, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>