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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. Placing concrete in excavated mud seam in the rock above the tunnel lining. Contract 12. July 20, 1911." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-ddb1-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Rondout pressure tunnel. Placing concrete in excavated mud seam in the rock above the tunnel lining. Contract 12. July 20, 1911." New York Public Library Digital Collections. Accessed November 30, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-ddb1-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Rondout pressure tunnel. Placing concrete in excavated mud seam in the rock above the tunnel lining. Contract 12. July 20, 1911. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-ddb1-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-ddb1-a3d9-e040-e00a18064a99 | title=
(still image)
Rondout pressure tunnel. Placing concrete in excavated mud seam in the rock above the tunnel lining. Contract 12. July 20, 1911., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 30, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>