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Region
- United States82
- Virginia12
- Arizona7
- Washington (D.C.)6
- Alaska5
- California4
- Louisiana4
- Massachusetts4
- Michigan4
- Minnesota4
- New Mexico4
- New York (State)4
- Pennsylvania4
- Tennessee4
- Texas4
- Utah4
- Apostle Islands National Lakeshore (Wis.)3
- Denali National Park and Preserve (Alaska)3
- Glacier National Park (Mont.)3
- Kennesaw Mountain National Battlefield Park (Ga.)3