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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map showing the lines of communication between southern Colorado and northern New Mexico " The New York Public Library Digital Collections. 1876. https://old-digitalcollections.nypl.org/items/8caf5450-1fd6-0136-7719-1f1d6973c0f4
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map showing the lines of communication between southern Colorado and northern New Mexico " New York Public Library Digital Collections. Accessed September 21, 2026. https://old-digitalcollections.nypl.org/items/8caf5450-1fd6-0136-7719-1f1d6973c0f4
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1876). Map showing the lines of communication between southern Colorado and northern New Mexico Retrieved from https://old-digitalcollections.nypl.org/items/8caf5450-1fd6-0136-7719-1f1d6973c0f4
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/8caf5450-1fd6-0136-7719-1f1d6973c0f4 | title=
(cartographic)
Map showing the lines of communication between southern Colorado and northern New Mexico , (1876)
|author=Digital Collections, The New York Public Library |accessdate=September 21, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>