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Subject (Region)
- United States[remove]1,758
- West (U.S.)1,745
- California136
- West United States88
- Rocky Mountains73
- United States, West54
- Oregon44
- Pacific States42
- Utah41
- Colorado38
- Mississippi River Valley38
- New Mexico37
- Southern States35
- Oregon National Historic Trail31
- Canada28
- Yellowstone National Park26
- Middle West23
- Montana22
- États-Unis22
- États-Unis (Ouest)22