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© The New York Public Library, 2026
The New York Public Library is a 501(c)(3) | EIN 13-1887440
Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Borings. Dimond drill mounted on platform at Hudson Pressure Tunnel crossing of the Hudson river. June 26, 1908." The New York Public Library Digital Collections. 1918. https://old-digitalcollections.nypl.org/items/510d47da-de1b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Borings. Dimond drill mounted on platform at Hudson Pressure Tunnel crossing of the Hudson river. June 26, 1908." New York Public Library Digital Collections. Accessed September 27, 2026. https://old-digitalcollections.nypl.org/items/510d47da-de1b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Borings. Dimond drill mounted on platform at Hudson Pressure Tunnel crossing of the Hudson river. June 26, 1908. Retrieved from https://old-digitalcollections.nypl.org/items/510d47da-de1b-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47da-de1b-a3d9-e040-e00a18064a99 | title=
(still image)
Borings. Dimond drill mounted on platform at Hudson Pressure Tunnel crossing of the Hudson river. June 26, 1908., (1918)|author=Digital Collections, The New York Public Library |accessdate=September 27, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>