Relief shown by hachures.
Latidudinal and longitudinal lines.
Prime meridians: Greenwich (top) and Washington (bottom).
2 bar scales on map, given in "statute miles" and "geographical miles."
Includes legend and table of distances: Emigrant route from Missouri to Oregon.
Shows topography, drainage, political boundaries, cities and towns, forts, trading houses, railroads, routes (e.g.: Lewis and Clarkes route -- Doniphan's route 1847), battles (e.g.: Battle of Buena Vista.)
Features Native American territories.
"Entered according to Act of Congress in the year 1850 by Thomas Cowperthait & Co. in the Clerks office of the District Court of the eastern district of Pennsylvania."
Collector's note: Eberstadt's catalogue entry states that this separate issue has additional mining towns not shown in W-GR 202.
Inset: Gold region of California.