Map shows major physical features, areas of Indian habitation, major cities and towns; northern portion of map is labeled Oregon Territory, Missouri Territory, southern portion is Upper California and New Mexico; February 1848 treaty boundary line between Mexico and the United States. Includes notes and "explanations." Inset: "Profile of the travelling route from the South Pass of the the Rocky Mountains to the Bay of San Francisco." Relief shown by hachures and spot heights, and by profile. Scale [1:3,000,000].