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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Superstructures. Breakneck Gaging chamber, located south of Breakneck grade tunnel, in Putnam county, N.Y. Contracat 109. August 29, 1916." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-ddd0-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Superstructures. Breakneck Gaging chamber, located south of Breakneck grade tunnel, in Putnam county, N.Y. Contracat 109. August 29, 1916." New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-ddd0-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Superstructures. Breakneck Gaging chamber, located south of Breakneck grade tunnel, in Putnam county, N.Y. Contracat 109. August 29, 1916. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-ddd0-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-ddd0-a3d9-e040-e00a18064a99 | title=
(still image)
Superstructures. Breakneck Gaging chamber, located south of Breakneck grade tunnel, in Putnam county, N.Y. Contracat 109. August 29, 1916., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>