“Fremont's Map of Oregon and Upper Californi . . . is without question one of the most important 19th Century maps of the American West. As noted by Carl Wheat, "in the history of the American West, the year 1848 is signalized by three events above all others, the discovery of gold at Sutter's Mill… the formal close of the Mexican War… which brought the cession of California and New Mexico… and the creation of the Territory of Oregon… All three events figure in the characteristic maps produced during the year, and particularly the cartographic monument of 1848, the magnificent 'Map of Oregon and Upper California'" (Wheat 49)...More than any other persons, John Charles Fremont and Charles Preuss dominate the cartography of the American West during the three years before the Gold Rush and brought a human tide surging into that land which had so long lain beyond the ken of most Americans" (Wheat, Mapping of the Transmississippi West, 523).”
https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~1820~170046:Map-Of-Oregon-And-Upper-California-#
https://www.raremaps.com/gallery/detail/60107/rare-gold-rush-edition-map-of-oregon-and-upper-california-fremont-preuss
https://www.loc.gov/item/79692900/
