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Photographs of the construction of the Holland Tunnel, 1919-1927
General Research Division, The New York Public Library. "Roof girders and sided angles, roof plates on bloking. Spring Street, April 13, 1921." The New York Public Library Digital Collections. 1921. https://digitalcollections.nypl.org/items/510d47da-dc29-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Roof girders and sided angles, roof plates on bloking. Spring Street, April 13, 1921." New York Public Library Digital Collections. Accessed April 28, 2024. https://digitalcollections.nypl.org/items/510d47da-dc29-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1921). Roof girders and sided angles, roof plates on bloking. Spring Street, April 13, 1921. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dc29-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dc29-a3d9-e040-e00a18064a99 | title=
(still image)
Roof girders and sided angles, roof plates on bloking. Spring Street, April 13, 1921., (1921)|author=Digital Collections, The New York Public Library |accessdate=April 28, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>