1. Map of an exploring expedition to the Rocky Mountains in the year 1842 and to Oregon & North California in the years 1843-44 Maps University Of Minnesota Public content 1845. Frémont, John Charles, 1813-1890. Relief shown by hachures.; Originally published in report of the Exploring Expedition to the Rocky Mountains in the year 1842 and to Oregon and Nor... Gales and Seaton? (Washington, D.C.?).