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Subject (Region)
- District of Columbia88
- United States14
- Virginia11
- Georgia8
- Great Britain8
- New York, New York8
- California7
- Texas7
- Potomac River6
- Alabama5
- Anacostia River (District of Columbia/Maryland)5
- Columbia River (Canada/Oregon/Washington)5
- Mississippi River5
- New Orleans, Louisiana5
- Panama Canal (Panama)5
- Rock Creek Park (District of Columbia)5
- South Carolina5
- Baltimore, Maryland4
- Delaware4
- Delaware River (Delaware/New Jersey/Pennsylvania)4