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Subject (Region)
- United States898
- West (U.S.)642
- North America404
- California357
- Canada310
- Alaska278
- Oklahoma269
- Southwest, New267
- New Mexico266
- Arizona261
- Oregon180
- Texas178
- Montana158
- New York (State)138
- South Dakota134
- British Columbia128
- Washington (State)124
- Indian Territory121
- Great Plains116
- Northwest, Pacific113