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Subject (Region)
- District of Columbia36
- United States17
- New Mexico Territory (1850-1912)16
- Alaska, Department and District of (1867-1912)15
- Hot Springs National Park (Arkansas)15
- Yellowstone National Park15
- Arizona Territory (1863-1912)13
- Indian Territory (1834-1907)12
- Yosemite National Park (California)12
- Sequoia National Park (California)11
- Kings Canyon National Park (California)9
- Oklahoma Territory (1890-1907)9
- Nicaragua Canal (Nicaragua)7
- Utah Territory (1850-1896)6
- Idaho5
- Montana5
- North Dakota5
- South Dakota5
- Washington5
- Wyoming5