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Subject (Region)
- District of Columbia339
- Nicaragua Canal (Nicaragua)19
- United States18
- Yellowstone National Park17
- Hot Springs National Park (Arkansas)15
- New Mexico Territory (1850-1912)15
- Arizona Territory (1863-1912)14
- Alaska, Department and District of (1867-1912)12
- Yosemite National Park (California)12
- Indian Territory (1834-1907)11
- Nicaragua11
- Sequoia National Park (California)11
- Utah Territory (1850-1896)10
- Kings Canyon National Park (California)9
- Oklahoma Territory (1890-1907)9
- Panama8
- Canal Zone6
- Dakota Territory (1861-1889)4
- Hot Springs, Arkansas4
- Idaho Territory (1863-1890)4