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Subject (Region)
- Oklahoma79
- Montana50
- North Dakota36
- Minnesota34
- Kansas33
- South Dakota32
- Indian Territory (1834-1907)22
- Wyoming21
- Fort Berthold Indian Reservation (North Dakota)18
- Nebraska17
- Washington17
- Oregon16
- Wisconsin15
- California14
- Colorado13
- Flathead Indian Reservation (Montana)12
- Idaho12
- New Mexico12
- Oklahoma Territory (1890-1907)12
- Utah12