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Subject (Region)
- West (U.S.)703
- United States550
- Canada442
- Amérique du Nord297
- Northwest, Canadian289
- Mississippi River Valley187
- Southwest, New147
- Oregon140
- California123
- New Mexico117
- Alaska115
- Northwestern States115
- North America103
- Virginia100
- Mississippi River99
- Northwest, Pacific93
- Oregon National Historic Trail92
- British Columbia91
- New York (State)88
- Louisiana81