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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Wallkill pressure tunnel. Concrete for walls of chamber over Drainage shaft in place. ... Contract 47. November 10, 1911." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dda8-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Wallkill pressure tunnel. Concrete for walls of chamber over Drainage shaft in place. ... Contract 47. November 10, 1911." New York Public Library Digital Collections. Accessed November 30, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dda8-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Wallkill pressure tunnel. Concrete for walls of chamber over Drainage shaft in place. ... Contract 47. November 10, 1911. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dda8-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dda8-a3d9-e040-e00a18064a99 | title=
(still image)
Wallkill pressure tunnel. Concrete for walls of chamber over Drainage shaft in place. ... Contract 47. November 10, 1911., (1918)|author=Digital Collections, The New York Public Library |accessdate=November 30, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>