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Region
- United States26
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- Nebraska4
- Nevada4
- New York (State)4
- Georgia3
- Arizona2
- ArizonaGila County2
- Bighorn Mountains (Wyo. and Mont.)2
- Black Hills (S.D. and Wyo.)2
- CaliforniaPacific Coast2
- CaliforniaSalinas River Valley2
- Chesapeake Bay Region (Md. and Va.)2
- China2
- Colorado2
- Delmarva Peninsula2
- IdahoBonneville County2