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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Camps. Chemical dosing plant for treating the tunnel drainage and spoil-bank run-off from the South portal of Hunters Brook tunnel. Contract 23. May 13, 1910." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-de43-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Camps. Chemical dosing plant for treating the tunnel drainage and spoil-bank run-off from the South portal of Hunters Brook tunnel. Contract 23. May 13, 1910." New York Public Library Digital Collections. Accessed December 20, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-de43-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Camps. Chemical dosing plant for treating the tunnel drainage and spoil-bank run-off from the South portal of Hunters Brook tunnel. Contract 23. May 13, 1910. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-de43-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-de43-a3d9-e040-e00a18064a99 | title=
(still image)
Camps. Chemical dosing plant for treating the tunnel drainage and spoil-bank run-off from the South portal of Hunters Brook tunnel. Contract 23. May 13, 1910., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 20, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>