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Region
- United States6
- China2
- India2
- Islamic countries2
- Africa1
- Appalachian Region1
- Asia, Central1
- Central America1
- Central Oklahoma Aquifer (Okla.)1
- Clayton County (Ga.)1
- Colorado1
- ColoradoGreeley Region1
- ColoradoLamar Region1
- ColoradoLeadville Region1
- Earth (Planet)1
- Europe1
- Europe, Central1
- Front Range (Colo. and Wyo.)1
- Georgia1
- GermanyRhineland1