Rare 1852 edition of Mitchell's map of the West, predating the formation of Washington Territory. An early example of the Thomas Cowpertwait state of the map, shifting the landmass westward to show more of the Rocky Mountains and less of the Pacific Ocean (following the SA Mitchell editions of 1846-1850). Oregon extends to Missouri Territory and the Rocky Mountains. No counties are shown in Oregon Territory. In California, only Santa Barbara, Los Angeles and San Diego Counties appear south of Mariposa and Santa Barbara Counties. The Bartlett and Graham Line's which appear in later editions of the map, are not yet shown. Kearney's Route is shown, as is the Spanish Trail from Santa Fe to P Angeles. The Oregon Route is also shown, as is Fremont's route and Lewis & Clark's Route. Many early forts and Indian Tribes appear. The boundary of 1819 with Spain is also shown, pre-dating California's annexation into the US. Massive Tule Lake and no sign of Lake Tahoe. Santa Ana and Bernalilla and Rio Arriba Counties appear in New Mexico, the first edition to show the first two counties. A nice example of the scarce 1852 edition of the map.