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Subject (Region)
- United States91
- District of Columbia43
- Washington Aqueduct (District of Columbia)36
- Mississippi River30
- Great Lakes29
- France18
- Great Britain17
- Annapolis, Maryland16
- Niagara Falls13
- Yellowstone National Park12
- Virginia11
- Washington Monument11
- Denmark8
- James River (Virginia)8
- West Point, New York8
- China7
- North Carolina7
- Spain6
- Alaska Territory (1912-1959)5
- Cumberland Road5