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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. Tunnel excavation showing operation on both bench and heading in progress. Contract 12. July 20, 1909." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-ddab-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Rondout pressure tunnel. Tunnel excavation showing operation on both bench and heading in progress. Contract 12. July 20, 1909." New York Public Library Digital Collections. Accessed January 17, 2025. https://digitalcollections.nypl.org/items/510d47da-ddab-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Rondout pressure tunnel. Tunnel excavation showing operation on both bench and heading in progress. Contract 12. July 20, 1909. Retrieved from https://digitalcollections.nypl.org/items/510d47da-ddab-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-ddab-a3d9-e040-e00a18064a99 | title=
(still image)
Rondout pressure tunnel. Tunnel excavation showing operation on both bench and heading in progress. Contract 12. July 20, 1909., (1918)|author=Digital Collections, The New York Public Library |accessdate=January 17, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>