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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch exhibiting the position of Yorktown with the approaches" The New York Public Library Digital Collections. 1862. https://digitalcollections.nypl.org/items/8789ac70-f81b-0132-db20-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch exhibiting the position of Yorktown with the approaches" New York Public Library Digital Collections. Accessed May 22, 2025. https://digitalcollections.nypl.org/items/8789ac70-f81b-0132-db20-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1862). Sketch exhibiting the position of Yorktown with the approaches Retrieved from https://digitalcollections.nypl.org/items/8789ac70-f81b-0132-db20-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/8789ac70-f81b-0132-db20-58d385a7bbd0 | title=
(cartographic)
Sketch exhibiting the position of Yorktown with the approaches, (1862)
|author=Digital Collections, The New York Public Library |accessdate=May 22, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>