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Subject (Region)
- United States14
- South Africa6
- Africa, West4
- Africa3
- America3
- Arizona2
- Black Mesa (Navajo County and Apache County)2
- Black Mesa (Navajo County and Apache County, Ariz.)2
- Brazil2
- Caribbean Area2
- Africa, Sub-Saharan1
- Black Hills1
- Black Hills (S.D. and Wyo.)1
- Black Sea1
- Black Sea Region1
- Canada1
- Congo (Democratic Republic)1
- Great Britain1
- Greece1
- Italy1