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Subject (Region)
- District of Columbia53
- Black River (Arkansas/Missouri)39
- Alabama36
- Black Warrior River (Alabama)36
- Black Hills (South Dakota/Wyoming)17
- Black Hills National Forest (South Dakota/Wyoming)17
- Arkansas16
- Missouri15
- South Dakota15
- Black River (Louisiana)12
- Tennessee River12
- Louisiana10
- Africa9
- Pocahontas, Arkansas9
- Great Sioux Reservation8
- Muscle Shoals, Alabama8
- Tombigbee River (Alabama/Mississippi)8
- Jonesville, Louisiana7
- Coosa River (Alabama/Georgia)6
- France6