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Subject (Region)
- West (U.S.)9,474
- United States1,759
- California692
- Rocky Mountains295
- West United States281
- United States, West197
- Colorado185
- Oregon National Historic Trail181
- Mississippi River Valley162
- Utah158
- Oregon152
- Northwestern States147
- Southwest, New146
- Missouri River134
- Pacific States124
- Columbia River113
- Mexico109
- États-Unis (Ouest)108
- Canada106
- Yellowstone National Park105