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© The New York Public Library, 2023
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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the Butterfield Overland Trail mail route through the southwestern United States" The New York Public Library Digital Collections. 1857 - 1861. https://digitalcollections.nypl.org/items/9c096650-e21b-0132-c39b-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of the Butterfield Overland Trail mail route through the southwestern United States" New York Public Library Digital Collections. Accessed March 26, 2023. https://digitalcollections.nypl.org/items/9c096650-e21b-0132-c39b-58d385a7bbd0
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1857 - 1861). Map of the Butterfield Overland Trail mail route through the southwestern United States Retrieved from https://digitalcollections.nypl.org/items/9c096650-e21b-0132-c39b-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/9c096650-e21b-0132-c39b-58d385a7bbd0 | title=
(cartographic)
Map of the Butterfield Overland Trail mail route through the southwestern United States, (1857 - 1861)
|author=Digital Collections, The New York Public Library |accessdate=March 26, 2023 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>