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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 method of depositing fine selected earth through water at the up-stream face of Olive Bridge dam. Contract 3. April 27, 1914." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd32-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. View showing method of depositing fine selected earth through water at the up-stream face of Olive Bridge dam. Contract 3. April 27, 1914." New York Public Library Digital Collections. Accessed April 25, 2024. https://digitalcollections.nypl.org/items/510d47da-dd32-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. View showing method of depositing fine selected earth through water at the up-stream face of Olive Bridge dam. Contract 3. April 27, 1914. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd32-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd32-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View showing method of depositing fine selected earth through water at the up-stream face of Olive Bridge dam. Contract 3. April 27, 1914., (1918)|author=Digital Collections, The New York Public Library |accessdate=April 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>