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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Bonticou tunnel. Competed trimming of tunnel shown in foreground. ... Contract 47. June 9, 1911." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd9b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Bonticou tunnel. Competed trimming of tunnel shown in foreground. ... Contract 47. June 9, 1911." New York Public Library Digital Collections. Accessed November 30, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd9b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Bonticou tunnel. Competed trimming of tunnel shown in foreground. ... Contract 47. June 9, 1911. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd9b-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd9b-a3d9-e040-e00a18064a99 | title=
(still image)
Bonticou tunnel. Competed trimming of tunnel shown in foreground. ... Contract 47. June 9, 1911., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 30, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>