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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "City tunnel. Interior of temporary superstructure over Shaft 11 showing discharge pipe from float at left, telescope with crane in center, and at right traveling crane above and cable reel below. Contracts 140 and 166. January 5, 1917." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dddb-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "City tunnel. Interior of temporary superstructure over Shaft 11 showing discharge pipe from float at left, telescope with crane in center, and at right traveling crane above and cable reel below. Contracts 140 and 166. January 5, 1917." New York Public Library Digital Collections. Accessed December 3, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dddb-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). City tunnel. Interior of temporary superstructure over Shaft 11 showing discharge pipe from float at left, telescope with crane in center, and at right traveling crane above and cable reel below. Contracts 140 and 166. January 5, 1917. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dddb-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dddb-a3d9-e040-e00a18064a99 | title=
(still image)
City tunnel. Interior of temporary superstructure over Shaft 11 showing discharge pipe from float at left, telescope with crane in center, and at right traveling crane above and cable reel below. Contracts 140 and 166. January 5, 1917., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 3, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>