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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 concrete core-wall of West dike with wooden forms in place. Placing and rolling embankment at right. Contract 3. June 21, 1910." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd37-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. View showing concrete core-wall of West dike with wooden forms in place. Placing and rolling embankment at right. Contract 3. June 21, 1910." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd37-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. View showing concrete core-wall of West dike with wooden forms in place. Placing and rolling embankment at right. Contract 3. June 21, 1910. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd37-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd37-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View showing concrete core-wall of West dike with wooden forms in place. Placing and rolling embankment at right. Contract 3. June 21, 1910., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>