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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Eastview tunnel. View showing forms in place with completed arch and side-wall in foreground. ... Contract 52. april 25, 1912." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-dd9f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Eastview tunnel. View showing forms in place with completed arch and side-wall in foreground. ... Contract 52. april 25, 1912." New York Public Library Digital Collections. Accessed April 25, 2024. https://digitalcollections.nypl.org/items/510d47da-dd9f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Eastview tunnel. View showing forms in place with completed arch and side-wall in foreground. ... Contract 52. april 25, 1912. Retrieved from https://digitalcollections.nypl.org/items/510d47da-dd9f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-dd9f-a3d9-e040-e00a18064a99 | title=
(still image)
Eastview tunnel. View showing forms in place with completed arch and side-wall in foreground. ... Contract 52. april 25, 1912., (1918)|author=Digital Collections, The New York Public Library |accessdate=April 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>