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Subject (Region)
- West (U.S.)[remove]147
- United States67
- California34
- Montana22
- Colorado21
- New Mexico15
- Wyoming15
- Utah13
- Arizona11
- Nebraska11
- Oklahoma11
- Oregon9
- Washington (State)9
- Alaska8
- Great Plains8
- Missouri8
- South Dakota8
- Texas8
- Idaho7
- Kansas7