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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Rondout pressure tunnel. ... Contract 12. September 11, 1916." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-ddc6-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Rondout pressure tunnel. ... Contract 12. September 11, 1916." New York Public Library Digital Collections. Accessed December 3, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-ddc6-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Rondout pressure tunnel. ... Contract 12. September 11, 1916. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-ddc6-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-ddc6-a3d9-e040-e00a18064a99 | title=
(still image)
Rondout pressure tunnel. ... Contract 12. September 11, 1916., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 3, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>