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Region
- Afghanistan2
- Agra (India)1
- Ahmadābād (India)1
- Alabama1
- AlaskaKodiak Archipelago1
- AlaskaKodiak Island1
- AlaskaKuskokwim Bay1
- AlaskaTaylor Mountains1
- Appalachian Basin1
- Appalachian Region12
- Arkansas1
- Asia1
- Asia, Central1
- Australia1
- Bangladesh1
- Blue River Watershed (Kan. and Mo.)1
- BrazilRecife1
- BrazilRio de Janeiro1
- California1
- CaliforniaAntelope Valley1