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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. Mayor John Purroy Mitchel switching on current to celebrate the excavation of the last heading of the City tunnel. Contract 65. Junuary 12, 1914." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-de4e-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Organization. City tunnel. Mayor John Purroy Mitchel switching on current to celebrate the excavation of the last heading of the City tunnel. Contract 65. Junuary 12, 1914." New York Public Library Digital Collections. Accessed February 1, 2025. https://digitalcollections.nypl.org/items/510d47da-de4e-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Organization. City tunnel. Mayor John Purroy Mitchel switching on current to celebrate the excavation of the last heading of the City tunnel. Contract 65. Junuary 12, 1914. Retrieved from https://digitalcollections.nypl.org/items/510d47da-de4e-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-de4e-a3d9-e040-e00a18064a99 | title=
(still image)
Organization. City tunnel. Mayor John Purroy Mitchel switching on current to celebrate the excavation of the last heading of the City tunnel. Contract 65. Junuary 12, 1914., (1918)|author=Digital Collections, The New York Public Library |accessdate=February 1, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>