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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Ashokan Reservoir. View of Olive Bridge dam just after removal of the stream-control pipes. Stream flowing through temporary conduit in dam. Contract 3. December 5, 1908." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd28-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. View of Olive Bridge dam just after removal of the stream-control pipes. Stream flowing through temporary conduit in dam. Contract 3. December 5, 1908." New York Public Library Digital Collections. Accessed November 23, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd28-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. View of Olive Bridge dam just after removal of the stream-control pipes. Stream flowing through temporary conduit in dam. Contract 3. December 5, 1908. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd28-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd28-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View of Olive Bridge dam just after removal of the stream-control pipes. Stream flowing through temporary conduit in dam. Contract 3. December 5, 1908., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>