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© The New York Public Library, 2024
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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. View looking up incline to platform from which concrete is shoveled into arch forms. Contract 12. October 10, 1910." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-ddbb-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Rondout pressure tunnel. View looking up incline to platform from which concrete is shoveled into arch forms. Contract 12. October 10, 1910." New York Public Library Digital Collections. Accessed December 20, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-ddbb-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Rondout pressure tunnel. View looking up incline to platform from which concrete is shoveled into arch forms. Contract 12. October 10, 1910. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-ddbb-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-ddbb-a3d9-e040-e00a18064a99 | title=
(still image)
Rondout pressure tunnel. View looking up incline to platform from which concrete is shoveled into arch forms. Contract 12. October 10, 1910., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>