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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Esopus cut-and-cover. ... Contract 11. April 7, 1909." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd81-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Esopus cut-and-cover. ... Contract 11. April 7, 1909." New York Public Library Digital Collections. Accessed January 31, 2025. https://digitalcollections.nypl.org/items/510d47da-dd81-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Esopus cut-and-cover. ... Contract 11. April 7, 1909. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd81-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd81-a3d9-e040-e00a18064a99 | title=
(still image)
Esopus cut-and-cover. ... Contract 11. April 7, 1909., (1918)|author=Digital Collections, The New York Public Library |accessdate=January 31, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>