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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. Intrerior of temporary superstructure over Drainage shaft showing gas-engine hoist and switchboard on right, ... Contract 90. August 31, 1914." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dddc-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Hudson pressure tunnel. Intrerior of temporary superstructure over Drainage shaft showing gas-engine hoist and switchboard on right, ... Contract 90. August 31, 1914." New York Public Library Digital Collections. Accessed December 4, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dddc-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Hudson pressure tunnel. Intrerior of temporary superstructure over Drainage shaft showing gas-engine hoist and switchboard on right, ... Contract 90. August 31, 1914. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dddc-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dddc-a3d9-e040-e00a18064a99 | title=
(still image)
Hudson pressure tunnel. Intrerior of temporary superstructure over Drainage shaft showing gas-engine hoist and switchboard on right, ... Contract 90. August 31, 1914., (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>