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Subject (Region)
- West (U.S.)1,791
- United States368
- Mississippi River Valley91
- West United States81
- California49
- United States, West39
- Oregon National Historic Trail26
- Northwest, Canadian17
- Northwestern States17
- Northwest, Pacific16
- Oregon15
- Louisiana14
- Missouri14
- North America14
- Kansas13
- America12
- Missouri River12
- New France12
- Texas12
- Arizona11