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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 Glenford dike showing relocated Ulster and Delaware railroad and water in East basin of reservoir. Contract 60. June 25, 1916." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd3e-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. View of Glenford dike showing relocated Ulster and Delaware railroad and water in East basin of reservoir. Contract 60. June 25, 1916." New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/510d47da-dd3e-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. View of Glenford dike showing relocated Ulster and Delaware railroad and water in East basin of reservoir. Contract 60. June 25, 1916. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd3e-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd3e-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View of Glenford dike showing relocated Ulster and Delaware railroad and water in East basin of reservoir. Contract 60. June 25, 1916., (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>