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Subject (Region)
- California[remove]136
- Nevada13
- Colorado12
- Yosemite National Park (California)12
- United States11
- Utah11
- North Dakota10
- Oregon10
- South Dakota10
- Washington9
- Wyoming9
- Idaho8
- Montana8
- New Mexico Territory (1850-1912)8
- Point Reyes National Seashore (California)8
- Arizona Territory (1863-1912)7
- Nebraska7
- Puerto Rico6
- Angeles National Forest (California)5
- Arizona5