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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "[Maps of the Washington Aqueduct, Md. and Washington D.C.]" The New York Public Library Digital Collections. 1864. https://qa-digitalcollections.nypl.org/items/93586a50-76e6-0135-24a1-71c4b2e9f12f
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "[Maps of the Washington Aqueduct, Md. and Washington D.C.]" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/93586a50-76e6-0135-24a1-71c4b2e9f12f
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1864). [Maps of the Washington Aqueduct, Md. and Washington D.C.] Retrieved from https://qa-digitalcollections.nypl.org/items/93586a50-76e6-0135-24a1-71c4b2e9f12f
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/93586a50-76e6-0135-24a1-71c4b2e9f12f | title=
(cartographic)
[Maps of the Washington Aqueduct, Md. and Washington D.C.], (1864)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>