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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 looking east across Hudson river towards Breakneck mountain with plant at East test-shaft at base of mountain. Contract 90. May 28, 1909." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-ddc8-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Hudson pressure tunnel. View looking east across Hudson river towards Breakneck mountain with plant at East test-shaft at base of mountain. Contract 90. May 28, 1909." New York Public Library Digital Collections. Accessed December 3, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-ddc8-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Hudson pressure tunnel. View looking east across Hudson river towards Breakneck mountain with plant at East test-shaft at base of mountain. Contract 90. May 28, 1909. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-ddc8-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-ddc8-a3d9-e040-e00a18064a99 | title=
(still image)
Hudson pressure tunnel. View looking east across Hudson river towards Breakneck mountain with plant at East test-shaft at base of mountain. Contract 90. May 28, 1909., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 3, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>