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Photographs of the Catskill water supply system in process of construction
Science, Industry and Business Library: General Collection , The New York Public Library. "Ashokan Reservoir. View showing loose stone gorge in Esopus creek at site of Olive Bridge dam. Contract 3." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd1c-a3d9-e040-e00a18064a99
Science, Industry and Business Library: General Collection , The New York Public Library. "Ashokan Reservoir. View showing loose stone gorge in Esopus creek at site of Olive Bridge dam. Contract 3." New York Public Library Digital Collections. Accessed January 17, 2021. https://digitalcollections.nypl.org/items/510d47da-dd1c-a3d9-e040-e00a18064a99
Science, Industry and Business Library: General Collection , The New York Public Library. (1918). Ashokan Reservoir. View showing loose stone gorge in Esopus creek at site of Olive Bridge dam. Contract 3. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd1c-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd1c-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View showing loose stone gorge in Esopus creek at site of Olive Bridge dam. Contract 3., (1918)|author=Digital Collections, The New York Public Library |accessdate=January 17, 2021 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>