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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of Oregon and upper California from the surveys of John Charles Frémont and other authorities " The New York Public Library Digital Collections. 1848. http://digitalcollections.nypl.org/items/1911f600-20aa-0136-49a2-0d18b385eef2
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Map of Oregon and upper California from the surveys of John Charles Frémont and other authorities " New York Public Library Digital Collections. Accessed February 18, 2019. http://digitalcollections.nypl.org/items/1911f600-20aa-0136-49a2-0d18b385eef2
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1848). Map of Oregon and upper California from the surveys of John Charles Frémont and other authorities Retrieved from http://digitalcollections.nypl.org/items/1911f600-20aa-0136-49a2-0d18b385eef2
<ref name=NYPL>{{cite web | url=http://digitalcollections.nypl.org/items/1911f600-20aa-0136-49a2-0d18b385eef2 | title=
(cartographic)
Map of Oregon and upper California from the surveys of John Charles Frémont and other authorities , (1848)
}}
|author=Digital Collections, The New York Public Library |accessdate=February 18, 2019 |publisher=The New York Public Library, Astor, Lennox, and Tilden Foundation}}</ref>