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Photographs of the Catskill water supply system in process of construction
General Research Division, The New York Public Library. "Moodna pressure tunnel. View at top of Shaft 7. Hudson river about 150 feet below. Contract 20. February 16, 1910." The New York Public Library Digital Collections. 1918. https://qa-digitalcollections.nypl.org/items/510d47da-dda3-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Moodna pressure tunnel. View at top of Shaft 7. Hudson river about 150 feet below. Contract 20. February 16, 1910." New York Public Library Digital Collections. Accessed December 1, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-dda3-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1918). Moodna pressure tunnel. View at top of Shaft 7. Hudson river about 150 feet below. Contract 20. February 16, 1910. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-dda3-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-dda3-a3d9-e040-e00a18064a99 | title=
(still image)
Moodna pressure tunnel. View at top of Shaft 7. Hudson river about 150 feet below. Contract 20. February 16, 1910., (1918)|author=Digital Collections, The New York Public Library |accessdate=December 1, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>