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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Surveys. Precise tape measurements on ice across the Hudson river between Storm King and Breakneck mountains. January 29, 1907." The New York Public Library Digital Collections. 1918. https://digitalcollections.nypl.org/items/510d47da-de1f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Surveys. Precise tape measurements on ice across the Hudson river between Storm King and Breakneck mountains. January 29, 1907." New York Public Library Digital Collections. Accessed April 27, 2024. https://digitalcollections.nypl.org/items/510d47da-de1f-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Surveys. Precise tape measurements on ice across the Hudson river between Storm King and Breakneck mountains. January 29, 1907. Retrieved from https://digitalcollections.nypl.org/items/510d47da-de1f-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-de1f-a3d9-e040-e00a18064a99 | title=
(still image)
Surveys. Precise tape measurements on ice across the Hudson river between Storm King and Breakneck mountains. January 29, 1907., (1918)|author=Digital Collections, The New York Public Library |accessdate=April 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>