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Region
- United States93
- Alaska13
- West (U.S.)10
- Africa8
- Great Britain6
- VirginiaRockingham County5
- AlaskaAnchorage4
- New York (State)Ithaca4
- Amazon River Valley3
- Colombia3
- EnglandNorthamptonshire3
- Europe3
- Hawaii3
- Idaho3
- Rio Grande Watershed (Colo.-Mexico and Tex.)3
- Sequoia National Park (Calif.)3
- UtahSalt Lake City3
- Africa, East2
- Asia2
- Austria2