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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Wallkill North cut-and-cover. ... Contract 47. October 4, 1912." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dd87-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Wallkill North cut-and-cover. ... Contract 47. October 4, 1912." New York Public Library Digital Collections. Accessed November 23, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dd87-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Wallkill North cut-and-cover. ... Contract 47. October 4, 1912. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dd87-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dd87-a3d9-e040-e00a18064a99 | title=
(still image)
Wallkill North cut-and-cover. ... Contract 47. October 4, 1912., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 23, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>