4.2. The Isthmus.

4.3. Mexico.

4.4. California.

4.5. Washoe.

4.6. Mr. Pepper.

4.7. Horace Greeley's Ride to Placerville.

4.8. To Reese River.

4.9. Great Salt Lake City.

4.10. The Mountain Fever.

4.11. "I am Here."