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Subject (Region)
- District of Columbia[remove]14
- United States14
- Yellowstone National Park[remove]14
- Hot Springs National Park (Arkansas)13
- New Mexico Territory (1850-1912)11
- Yosemite National Park (California)11
- Alaska, Department and District of (1867-1912)10
- Arizona Territory (1863-1912)10
- Sequoia National Park (California)10
- Indian Territory (1834-1907)9
- Kings Canyon National Park (California)9
- Nicaragua Canal (Nicaragua)7
- Oklahoma Territory (1890-1907)7
- Utah Territory (1850-1896)6
- Nicaragua4
- Dakota Territory (1861-1889)2
- Hot Springs, Arkansas2
- Idaho Territory (1863-1890)2
- Montana Territory (1864-1889)2
- Washington Territory (1853-1889)2