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Subject (Region)
- District of Columbia404
- United States36
- Yellowstone National Park16
- Hot Springs National Park (Arkansas)15
- New Mexico Territory (1850-1912)15
- Panama15
- Nicaragua Canal (Nicaragua)14
- Arizona Territory (1863-1912)13
- Alaska, Department and District of (1867-1912)12
- Yosemite National Park (California)12
- Indian Territory (1834-1907)11
- Sequoia National Park (California)11
- Kings Canyon National Park (California)9
- Oklahoma Territory (1890-1907)9
- Utah Territory (1850-1896)9
- Canal Zone8
- Nicaragua7
- Saint Louis, Missouri7
- California5
- Chesapeake and Ohio Canal (District of Columbia/Maryland/West Virginia)3