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.

Brief summary of south-central Idaho, including descriptions of subregions, mammals, birds, and reptiles.

Map shows late nineteenth century Idaho railroads, counties, cities, and towns. Relief shown by hachures. Scale [ca. 1:4,679,000] and [ca. 1:3,802,000].