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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Breakneck pressure tunnel. ... Contract 80. August 29, 1916." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-ddca-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Breakneck pressure tunnel. ... Contract 80. August 29, 1916." New York Public Library Digital Collections. Accessed May 2, 2024. https://digitalcollections.nypl.org/items/510d47da-ddca-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Breakneck pressure tunnel. ... Contract 80. August 29, 1916. Retrieved from https://digitalcollections.nypl.org/items/510d47da-ddca-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-ddca-a3d9-e040-e00a18064a99 | title=
(still image)
Breakneck pressure tunnel. ... Contract 80. August 29, 1916., (1918)|author=Digital Collections, The New York Public Library |accessdate=May 2, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>