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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. Completed excavation with temporary roof timbering in place. Finished concrete lining in background. Contract 12. April 21, 1911." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-ddba-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Rondout pressure tunnel. Completed excavation with temporary roof timbering in place. Finished concrete lining in background. Contract 12. April 21, 1911." New York Public Library Digital Collections. Accessed February 8, 2025. https://digitalcollections.nypl.org/items/510d47da-ddba-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Rondout pressure tunnel. Completed excavation with temporary roof timbering in place. Finished concrete lining in background. Contract 12. April 21, 1911. Retrieved from https://digitalcollections.nypl.org/items/510d47da-ddba-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-ddba-a3d9-e040-e00a18064a99 | title=
(still image)
Rondout pressure tunnel. Completed excavation with temporary roof timbering in place. Finished concrete lining in background. Contract 12. April 21, 1911., (1918)|author=Digital Collections, The New York Public Library |accessdate=February 8, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>