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Subject (Region)
- Colorado7
- Great Plains5
- California4
- Idaho4
- South Dakota4
- Arkansas River3
- Missouri River3
- Montana3
- Nebraska3
- Nevada3
- New Mexico Territory (1850-1912)3
- Texas3
- Utah Territory (1850-1896)3
- Yellowstone River (Montana/Wyoming)3
- Black Hills (South Dakota/Wyoming)2
- Carson River (Nevada)2
- National Zoological Park2
- Nicaragua2
- Nicaragua Canal (Nicaragua)2
- Ohio2