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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Aerators. General view from Middle dike of Ashokan reservoir shoeing the Lower gate-chamber in foreground and aerator in full operation beyond. ... Contract 10. June 20, 1917." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-de0c-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Aerators. General view from Middle dike of Ashokan reservoir shoeing the Lower gate-chamber in foreground and aerator in full operation beyond. ... Contract 10. June 20, 1917." New York Public Library Digital Collections. Accessed December 20, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-de0c-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Aerators. General view from Middle dike of Ashokan reservoir shoeing the Lower gate-chamber in foreground and aerator in full operation beyond. ... Contract 10. June 20, 1917. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-de0c-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-de0c-a3d9-e040-e00a18064a99 | title=
(still image)
Aerators. General view from Middle dike of Ashokan reservoir shoeing the Lower gate-chamber in foreground and aerator in full operation beyond. ... Contract 10. June 20, 1917., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>