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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. View of Olive Bridge dam showing down-stream face of masonry section. Stone crusher and concrete mixing plant in left background. Contract 3. June 21, 1910." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd2b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. View of Olive Bridge dam showing down-stream face of masonry section. Stone crusher and concrete mixing plant in left background. Contract 3. June 21, 1910." New York Public Library Digital Collections. Accessed October 6, 2024. https://digitalcollections.nypl.org/items/510d47da-dd2b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. View of Olive Bridge dam showing down-stream face of masonry section. Stone crusher and concrete mixing plant in left background. Contract 3. June 21, 1910. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd2b-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd2b-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. View of Olive Bridge dam showing down-stream face of masonry section. Stone crusher and concrete mixing plant in left background. Contract 3. June 21, 1910., (1918)|author=Digital Collections, The New York Public Library |accessdate=October 6, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>