Report of the exploring expedition to the Rocky Mountains in the year 1842 : and to Oregon and north California in the years 1843-44
Official U.S. government report of John C. Frémont's Army Corps of Engineers surveys of the Rocky Mountains, Oregon and northern California, printed in Washington in 1845 for Congress, with botanical and geological appendices by John Torrey and James Hall. Steel-engraved landscapes render basalt cliffs and canyon walls in fine hatched line, alongside hachured route maps of rivers, lake basins and mountain ranges.
