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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Hudson pressure tunnel. View of Drainage shaft showing completed steel interlining, .. Contract 90. December 12, 1913." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-ddd7-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Hudson pressure tunnel. View of Drainage shaft showing completed steel interlining, .. Contract 90. December 12, 1913." New York Public Library Digital Collections. Accessed April 19, 2024. https://digitalcollections.nypl.org/items/510d47da-ddd7-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Hudson pressure tunnel. View of Drainage shaft showing completed steel interlining, .. Contract 90. December 12, 1913. Retrieved from https://digitalcollections.nypl.org/items/510d47da-ddd7-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-ddd7-a3d9-e040-e00a18064a99 | title=
(still image)
Hudson pressure tunnel. View of Drainage shaft showing completed steel interlining, .. Contract 90. December 12, 1913., (1918)|author=Digital Collections, The New York Public Library |accessdate=April 19, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>