Fine example of this seminal map of the American West, depicting the region at the time the earliest surveys for the Transcontinental Railroad were just beginning.
The map map shows the West shortly after the start of the California Gold Rush, but before the creation of Arizona, Nevada, Colorado, Idaho, Wyoming and Montana.
The map shows Spanish Trail, Cooke's Wagon Route, Kearney's Route, Lewis & Clarke's Canoe Route, Oregon Route, early roads, towns, Indian Tribes, mining claims, mountains, rivers, etc.
No Lake Tahoe appears, but a massive Tule Lake dominates Southern California.
Only very early California Counties shown. For example, Ventura and San Bernardino County do not yet appear.
Pre-Gadsden purchase border with Mexico. Early forts located, especially in Oregon Territory. Nice topographical detail after Fremont, although still very conjectural in the Great Basin. The Southwest is dominated by several massive counties which extend the width of Utah Territory and New Mexico Territory. Only the western counties of Oregon and Washington appear.
A gorgeous full color example of this marvelous map.