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Subject (Region)
- United States[remove]3,804
- États-Unis43
- District of Columbia21
- Government publications20
- Yellowstone National Park20
- California17
- Hot Springs National Park (Arkansas)17
- Yosemite National Park (California)16
- Indian Territory (1834-1907)15
- Alaska, Department and District of (1867-1912)14
- Sequoia National Park (California)14
- New Mexico Territory (1850-1912)13
- Europe12
- Latin America12
- Soviet Union12
- Alaska11
- Canada11
- Japan11
- Kings Canyon National Park (California)11
- Mexico11