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Subject (Region)
- District of Columbia32
- Alaska, Department and District of (1867-1912)30
- United States30
- Indian Territory (1834-1907)18
- New Mexico Territory (1850-1912)18
- Hot Springs National Park (Arkansas)17
- Yellowstone National Park17
- Yosemite National Park (California)16
- Sequoia National Park (California)14
- Arizona Territory (1863-1912)13
- Kings Canyon National Park (California)11
- Central America8
- Mexico8
- Oklahoma Territory (1890-1907)8
- Puerto Rico8
- South America8
- Utah Territory (1850-1896)7
- Crater Lake National Park (Oregon)6
- Great Britain6
- Nicaragua Canal (Nicaragua)6