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Subject (Region)
- District of Columbia84
- Great Britain7
- Potomac River7
- England5
- Hot Springs, Arkansas4
- London4
- Panama4
- United States4
- Canal Zone3
- Colon, Panama3
- Illinois3
- Anacostia River (District of Columbia/Maryland)2
- Chicago2
- Germany (to 1949; 1990- )2
- Hot Springs Creek (Arkansas)2
- Italy2
- Massachusetts2
- Mexico2
- New Jersey2
- New York2