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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Borings. Boxes containing 1-inch, 1 3/4 -inch and 3-inch cores recovered from holes along the line of the City tunnel. .. November 12, 1909." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-de1d-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Borings. Boxes containing 1-inch, 1 3/4 -inch and 3-inch cores recovered from holes along the line of the City tunnel. .. November 12, 1909." New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-de1d-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Borings. Boxes containing 1-inch, 1 3/4 -inch and 3-inch cores recovered from holes along the line of the City tunnel. .. November 12, 1909. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-de1d-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-de1d-a3d9-e040-e00a18064a99 | title=
(still image)
Borings. Boxes containing 1-inch, 1 3/4 -inch and 3-inch cores recovered from holes along the line of the City tunnel. .. November 12, 1909., (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>