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Interborough rapid transit: the New York subway, its construction and equipment
Rare Book Division, The New York Public Library. "Inside wall of tunnel showing 64 ducts." The New York Public Library Digital Collections. 1904. https://digitalcollections.nypl.org/items/510d47dc-9b83-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "Inside wall of tunnel showing 64 ducts." New York Public Library Digital Collections. Accessed April 19, 2024. https://digitalcollections.nypl.org/items/510d47dc-9b83-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1904). Inside wall of tunnel showing 64 ducts. Retrieved from https://digitalcollections.nypl.org/items/510d47dc-9b83-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47dc-9b83-a3d9-e040-e00a18064a99 | title=
(still image)
Inside wall of tunnel showing 64 ducts., (1904)
|author=Digital Collections, The New York Public Library |accessdate=April 19, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>