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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. General view looking north at site of tunnel crossing. Breakneck mountain on right, Storm King on the left. Contract 90. August 29, 1916." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-ddc9-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Hudson pressure tunnel. General view looking north at site of tunnel crossing. Breakneck mountain on right, Storm King on the left. Contract 90. August 29, 1916." New York Public Library Digital Collections. Accessed December 4, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-ddc9-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Hudson pressure tunnel. General view looking north at site of tunnel crossing. Breakneck mountain on right, Storm King on the left. Contract 90. August 29, 1916. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-ddc9-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-ddc9-a3d9-e040-e00a18064a99 | title=
(still image)
Hudson pressure tunnel. General view looking north at site of tunnel crossing. Breakneck mountain on right, Storm King on the left. Contract 90. August 29, 1916., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 4, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>