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Subject (Region)
- United States[remove]117
- West (U.S.)11
- Montana10
- California7
- Texas7
- Yellowstone National Park7
- Canada6
- North America6
- Great Basin5
- New Mexico Territory (1850-1912)5
- Oregon5
- America4
- Gulf States4
- Indian Territory4
- Red River of Louisiana4
- Rocky Mountains4
- Southwest, Old4
- Wyoming4
- Alaska, Department and District of (1867-1912)3
- Frontier Formation3