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Subject (Region)
- Wyoming Territory (1868-1890)106
- Montana Territory (1864-1889)24
- Dakota Territory (1861-1889)22
- Wyoming20
- Montana16
- Mexico15
- Yellowstone National Park15
- Idaho Territory (1863-1890)14
- Yellowstone River (Montana/Wyoming)14
- Colorado12
- California11
- Arizona Territory (1863-1912)10
- Indian Territory (1834-1907)10
- Kansas10
- Cuba9
- Spain9
- Nebraska8
- New Mexico Territory (1850-1912)8
- South Carolina8
- District of Columbia7