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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 showing down-stream side of Glenford dike on top of which is located the relocated Ulster and Delaware Railroad tracks. Contract 60. April 28, 1914." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd3d-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. View showing down-stream side of Glenford dike on top of which is located the relocated Ulster and Delaware Railroad tracks. Contract 60. April 28, 1914." New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/510d47da-dd3d-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. View showing down-stream side of Glenford dike on top of which is located the relocated Ulster and Delaware Railroad tracks. Contract 60. April 28, 1914. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd3d-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd3d-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View showing down-stream side of Glenford dike on top of which is located the relocated Ulster and Delaware Railroad tracks. Contract 60. April 28, 1914., (1918)|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>