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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Key" The New York Public Library Digital Collections. 1891. https://digitalcollections.nypl.org/items/9817b01c-6d80-9cb5-e040-e00a180621b9
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Key" New York Public Library Digital Collections. Accessed March 19, 2024. https://digitalcollections.nypl.org/items/9817b01c-6d80-9cb5-e040-e00a180621b9
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1891). Key Retrieved from https://digitalcollections.nypl.org/items/9817b01c-6d80-9cb5-e040-e00a180621b9
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/9817b01c-6d80-9cb5-e040-e00a180621b9 | title=
(cartographic)
Key, (1891)
|author=Digital Collections, The New York Public Library |accessdate=March 19, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>