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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. Forms for concrete plug, 26 feet thick, in stream-control conduit in Olive Bridge dam. The 6-foot opening at bottom carries the flow of Esopus creek. Contract 3. August 25, 1913." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd30-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-control conduit in Olive Bridge dam. The 6-foot opening at bottom carries the flow of Esopus creek. Contract 3. August 25, 1913." New York Public Library Digital Collections. Accessed May 18, 2022. https://digitalcollections.nypl.org/items/510d47da-dd30-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-control conduit in Olive Bridge dam. The 6-foot opening at bottom carries the flow of Esopus creek. Contract 3. August 25, 1913. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd30-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd30-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-control conduit in Olive Bridge dam. The 6-foot opening at bottom carries the flow of Esopus creek. Contract 3. August 25, 1913., (1918)|author=Digital Collections, The New York Public Library |accessdate=May 18, 2022 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>