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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the Washington aqueduct to accompany supplemental report of chief engineer" The New York Public Library Digital Collections. 1864. https://digitalcollections.nypl.org/items/c09e4830-c484-0134-34f2-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the Washington aqueduct to accompany supplemental report of chief engineer" New York Public Library Digital Collections. Accessed October 9, 2024. https://digitalcollections.nypl.org/items/c09e4830-c484-0134-34f2-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1864). Map of the Washington aqueduct to accompany supplemental report of chief engineer Retrieved from https://digitalcollections.nypl.org/items/c09e4830-c484-0134-34f2-00505686a51c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/c09e4830-c484-0134-34f2-00505686a51c | title=
(cartographic)
Map of the Washington aqueduct to accompany supplemental report of chief engineer, (1864)
|author=Digital Collections, The New York Public Library |accessdate=October 9, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>