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Subject (Region)
- District of Columbia36
- Hawaii (to 1898)4
- Philippines4
- Chesapeake and Ohio Canal (District of Columbia/Maryland/West Virginia)3
- Pennsylvania3
- Puerto Rico3
- China2
- Germany (to 1949; 1990- )2
- Great Britain2
- Indian Territory (1834-1907)2
- Japan2
- Maryland2
- Ohio River2
- Potomac River2
- United States2
- Virginia2
- Alexandria, Virginia1
- Argentina1
- Australia1
- Austria1