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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. Steel diaphragm at tunnel end of drainage drift showing 8-foot opening to drift. ... Contract 67. September 17, 1914." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-ddd3-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "City tunnel. Steel diaphragm at tunnel end of drainage drift showing 8-foot opening to drift. ... Contract 67. September 17, 1914." New York Public Library Digital Collections. Accessed April 23, 2024. https://digitalcollections.nypl.org/items/510d47da-ddd3-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). City tunnel. Steel diaphragm at tunnel end of drainage drift showing 8-foot opening to drift. ... Contract 67. September 17, 1914. Retrieved from https://digitalcollections.nypl.org/items/510d47da-ddd3-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-ddd3-a3d9-e040-e00a18064a99 | title=
(still image)
City tunnel. Steel diaphragm at tunnel end of drainage drift showing 8-foot opening to drift. ... Contract 67. September 17, 1914., (1918)|author=Digital Collections, The New York Public Library |accessdate=April 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>