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Subject (Region)
- Alaska, Department and District of (1867-1912)12
- California9
- New Mexico Territory (1850-1912)8
- United States8
- Colorado River6
- Sierra Nevada (United States)6
- Rio Grande (Mexico/United States)5
- Texas5
- West (U.S.)5
- Yellowstone National Park5
- Great Britain4
- Mexico4
- Missouri River4
- Philippines4
- Utah Territory (1850-1896)4
- Alabama3
- Canada3
- Colorado3
- District of Columbia3
- Gila River (Arizona/New Mexico)3