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© The New York Public Library, 2024
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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Bonticou grade tunnel. South portal completed. Note stone boundary walls. Contract 47. August 23, 1917." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd97-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Bonticou grade tunnel. South portal completed. Note stone boundary walls. Contract 47. August 23, 1917." New York Public Library Digital Collections. Accessed December 12, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd97-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Bonticou grade tunnel. South portal completed. Note stone boundary walls. Contract 47. August 23, 1917. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd97-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd97-a3d9-e040-e00a18064a99 | title=
(still image)
Bonticou grade tunnel. South portal completed. Note stone boundary walls. Contract 47. August 23, 1917., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 12, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>