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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. Up-stream face of masonry portion of Olive Bridge dam. Note temporary opening for flow of Esopus creek. Contract 3. November 19, 1909." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd2a-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. Up-stream face of masonry portion of Olive Bridge dam. Note temporary opening for flow of Esopus creek. Contract 3. November 19, 1909." New York Public Library Digital Collections. Accessed November 23, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd2a-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. Up-stream face of masonry portion of Olive Bridge dam. Note temporary opening for flow of Esopus creek. Contract 3. November 19, 1909. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd2a-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd2a-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. Up-stream face of masonry portion of Olive Bridge dam. Note temporary opening for flow of Esopus creek. Contract 3. November 19, 1909., (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>