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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. Placing concrete in cut-off trench under masonry portion of Olive Bridge dam. Note grout pipes extending from concrete. Contract 3. October 3, 1908." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd24-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Ashokan Reservoir. Placing concrete in cut-off trench under masonry portion of Olive Bridge dam. Note grout pipes extending from concrete. Contract 3. October 3, 1908." New York Public Library Digital Collections. Accessed October 7, 2024. https://digitalcollections.nypl.org/items/510d47da-dd24-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Ashokan Reservoir. Placing concrete in cut-off trench under masonry portion of Olive Bridge dam. Note grout pipes extending from concrete. Contract 3. October 3, 1908. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd24-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd24-a3d9-e040-e00a18064a99 | title=
(still image)
Ashokan Reservoir. Placing concrete in cut-off trench under masonry portion of Olive Bridge dam. Note grout pipes extending from concrete. Contract 3. October 3, 1908., (1918)|author=Digital Collections, The New York Public Library |accessdate=October 7, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>