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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Post route map of the state of Colorado " The New York Public Library Digital Collections. 1880. https://digitalcollections.nypl.org/items/871c2cc0-1fd3-0136-2198-07fbbaf381b5
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Post route map of the state of Colorado " New York Public Library Digital Collections. Accessed April 19, 2021. https://digitalcollections.nypl.org/items/871c2cc0-1fd3-0136-2198-07fbbaf381b5
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1880). Post route map of the state of Colorado Retrieved from https://digitalcollections.nypl.org/items/871c2cc0-1fd3-0136-2198-07fbbaf381b5
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/871c2cc0-1fd3-0136-2198-07fbbaf381b5 | title=
(cartographic)
Post route map of the state of Colorado , (1880)
|author=Digital Collections, The New York Public Library |accessdate=April 19, 2021 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>