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Subject (Region)
- United States12
- West (U.S.)12
- California8
- Oregon2
- Oregon National Historic Trail2
- American Valley (Calif.)1
- California National Historic Trail1
- El Dorado County1
- Feather River Valley (Calif.)1
- Illinois1
- Mormon Pioneer National Historic Trail1
- Nelson Creek (Calif.)1
- Oregon Territory1
- Salt Lake City (Utah)1
- Sierra Nevada (Calif. and Nev.)1
- Yuba County1
- Yuba River Valley (Calif.)1