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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://old-digitalcollections.nypl.org/items/17dcd0f0-f07c-0134-c98b-65146ef3acc3
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 September 27, 2026. https://old-digitalcollections.nypl.org/items/17dcd0f0-f07c-0134-c98b-65146ef3acc3
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://old-digitalcollections.nypl.org/items/17dcd0f0-f07c-0134-c98b-65146ef3acc3
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/17dcd0f0-f07c-0134-c98b-65146ef3acc3 | 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=September 27, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>