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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "City tunnel. Shaft 20. ... Contract 67. June 11, 1913." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-de27-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "City tunnel. Shaft 20. ... Contract 67. June 11, 1913." New York Public Library Digital Collections. Accessed December 2, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-de27-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). City tunnel. Shaft 20. ... Contract 67. June 11, 1913. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-de27-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-de27-a3d9-e040-e00a18064a99 | title=
(still image)
City tunnel. Shaft 20. ... Contract 67. June 11, 1913., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 2, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>