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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of proposed main sewerage and drainage works for the improvement of the sanitary condition of the District of Columbia" The New York Public Library Digital Collections. 1890. https://qa-digitalcollections.nypl.org/items/6839f480-f095-0134-7d85-1da04d6a19cf
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of proposed main sewerage and drainage works for the improvement of the sanitary condition of the District of Columbia" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/6839f480-f095-0134-7d85-1da04d6a19cf
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1890). Map of proposed main sewerage and drainage works for the improvement of the sanitary condition of the District of Columbia Retrieved from https://qa-digitalcollections.nypl.org/items/6839f480-f095-0134-7d85-1da04d6a19cf
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/6839f480-f095-0134-7d85-1da04d6a19cf | title=
(cartographic)
Map of proposed main sewerage and drainage works for the improvement of the sanitary condition of the District of Columbia, (1890)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>