Map shows the mineral resources and mining activity in Idaho, Montana and Wyoming, railroads, military outposts, areas of Indian habitation and reservations, historical routes of exploration, counties, and settlements in Nebraska, Dakota Territory, Idaho, Montana, and Wyoming, and Yellowstone "National Park" in Wyoming. Relief shown by hachures and spot heights. Scale [ca. 1:3,400,000].

Map shows trail route from Independence, Missouri (and also St. Joseph) to Sacramento, California across the "political divisions of the Great West": Missouri, Kansas, Nebraska, South Dakota, Wyoming, Colorado, Idaho, Utah, Oregon, California, and Nevada, landmarks and areas of Indian habitation. Includes note describing area and history of the route. Inset: United States west of Mississippi River showing political divisions in 1849. Relief shown by hachures. Scale not given.