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Subject (Region)
- Black Hills National Forest (S.D. and Wyo.)18
- United States15
- Black Hills National Forest6
- America4
- Africa3
- Black Hills (S.D. and Wyo.)3
- Black Sea3
- Newfoundland and Labrador3
- Oklahoma3
- Québec (Province)3
- Southern States3
- Black Belt (Ala. and Miss.)2
- Black Forest2
- Black Kettle National Grassland2
- Black Kettle National Grassland (Okla. and Tex.)2
- Black Sea Region2
- Briggs Spring (S.D.)2
- Cibola National Forest2
- Cuba2
- Germany2