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Subject (Region)
- California[remove]24
- Rio Grande (Mexico/United States)7
- West (U.S.)7
- Gila River (Arizona/New Mexico)6
- Mississippi River6
- Alaska, Department and District of (1867-1912)5
- Colorado River5
- New Mexico Territory (1850-1912)5
- Sierra Nevada (United States)5
- United States5
- Colorado4
- Texas4
- Utah4
- Virginia4
- Great Britain3
- Green River (Colorado/Utah/Wyoming)3
- Montana3
- Oregon Territory (1848-1859)3
- San Diego, California3
- Wyoming3