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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. Excavation completed and concrete floor in place for masonry conduit to divert the flow of the Beaver Kill. Contract 3. August 4, 1908" The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd34-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. Excavation completed and concrete floor in place for masonry conduit to divert the flow of the Beaver Kill. Contract 3. August 4, 1908" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/510d47da-dd34-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. Excavation completed and concrete floor in place for masonry conduit to divert the flow of the Beaver Kill. Contract 3. August 4, 1908 Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd34-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd34-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. Excavation completed and concrete floor in place for masonry conduit to divert the flow of the Beaver Kill. Contract 3. August 4, 1908, (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>