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Photographs of the construction of the Holland Tunnel, 1919-1927
General Research Division, The New York Public Library. "General view. Caisson about ready to start sinking. Concrete chute at left, hoisting engines in front, air lines at side. Spring Street, June 24, 1921." The New York Public Library Digital Collections. 1921. https://qa-digitalcollections.nypl.org/items/510d47da-dc2f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "General view. Caisson about ready to start sinking. Concrete chute at left, hoisting engines in front, air lines at side. Spring Street, June 24, 1921." New York Public Library Digital Collections. Accessed November 26, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dc2f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1921). General view. Caisson about ready to start sinking. Concrete chute at left, hoisting engines in front, air lines at side. Spring Street, June 24, 1921. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dc2f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dc2f-a3d9-e040-e00a18064a99 | title=
(still image)
General view. Caisson about ready to start sinking. Concrete chute at left, hoisting engines in front, air lines at side. Spring Street, June 24, 1921., (1921)|author=Digital Collections, The New York Public Library |accessdate=November 26, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>