Nice large map of the United States, extending west to the Rock Mountains and the Great Salt Lake.
Includes and number of exploration routes, including:
- Stevens Route of the Proposed [Northern] Pacific Railroad
- Fremont's Route in 1844
- "Route Explored for Pacific RR by Lieut Beshwith [sic]"
- "Route Explored for Pacific RR by Capt Gunnison "
- Kearny's Route 1847