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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Ashokan Lower gate-chamber, with electrically-driven valves, vertical genartor operated by water turbine and overhead traveling crane. Contracts 31, 42, 43 and 56. August 31, 1917." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd4e-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Lower gate-chamber, with electrically-driven valves, vertical genartor operated by water turbine and overhead traveling crane. Contracts 31, 42, 43 and 56. August 31, 1917." New York Public Library Digital Collections. Accessed November 29, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd4e-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Lower gate-chamber, with electrically-driven valves, vertical genartor operated by water turbine and overhead traveling crane. Contracts 31, 42, 43 and 56. August 31, 1917. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd4e-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd4e-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Lower gate-chamber, with electrically-driven valves, vertical genartor operated by water turbine and overhead traveling crane. Contracts 31, 42, 43 and 56. August 31, 1917., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 29, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>