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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. April 20, 1911." The New York Public Library Digital Collections. 1918. https://old-digitalcollections.nypl.org/items/510d47da-de25-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Rondout pressure tunnel. ... Contract 12. April 20, 1911." New York Public Library Digital Collections. Accessed September 27, 2026. https://old-digitalcollections.nypl.org/items/510d47da-de25-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Rondout pressure tunnel. ... Contract 12. April 20, 1911. Retrieved from https://old-digitalcollections.nypl.org/items/510d47da-de25-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47da-de25-a3d9-e040-e00a18064a99 | title=
(still image)
Rondout pressure tunnel. ... Contract 12. April 20, 1911., (1918)|author=Digital Collections, The New York Public Library |accessdate=September 27, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>