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Subject (Region)
- United States54
- Pennsylvania10
- California9
- New York (State)8
- Virginia8
- New York6
- Illinois5
- Philadelphia5
- Arlington4
- Chicago4
- Massachusetts4
- Washington (D.C.)4
- West (U.S.)4
- Arizona3
- Florida3
- Grand Canyon National Park3
- Grand Canyon National Park (Ariz.)3
- Navy Pier (Chicago, Ill.)3
- North Carolina3
- Sequoia National Park3