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© The New York Public Library, 2026
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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Organization. City tunnel. Celebration ceremonies attending the holing through of the last heading of the City tunnel. Contract 65. January 12, 1914." The New York Public Library Digital Collections. 1918. https://old-digitalcollections.nypl.org/items/510d47da-de4f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Organization. City tunnel. Celebration ceremonies attending the holing through of the last heading of the City tunnel. Contract 65. January 12, 1914." New York Public Library Digital Collections. Accessed September 29, 2026. https://old-digitalcollections.nypl.org/items/510d47da-de4f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Organization. City tunnel. Celebration ceremonies attending the holing through of the last heading of the City tunnel. Contract 65. January 12, 1914. Retrieved from https://old-digitalcollections.nypl.org/items/510d47da-de4f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47da-de4f-a3d9-e040-e00a18064a99 | title=
(still image)
Organization. City tunnel. Celebration ceremonies attending the holing through of the last heading of the City tunnel. Contract 65. January 12, 1914., (1918)|author=Digital Collections, The New York Public Library |accessdate=September 29, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>