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Subject (Region)
- District of Columbia43
- Washington Aqueduct (District of Columbia)36
- Great Lakes29
- Mississippi River27
- Niagara Falls13
- Yellowstone National Park12
- Washington Monument11
- Alaska Territory (1912-1959)5
- France4
- Dalecarlia Reservoir (District of Columbia)3
- Great Britain3
- Hawaii Territory (1898-1959)3
- United States3
- Virginia3
- Cumberland Road2
- Governors Island (New York)2
- James River (Virginia)2
- Little Salmon River (New York)2
- Maine2
- Mexico2