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Subject (Region)
- United States297
- France72
- District of Columbia43
- Spain42
- Washington Aqueduct (District of Columbia)36
- Great Britain33
- Mississippi River33
- Great Lakes29
- Italy27
- Soviet Union23
- China17
- Germany17
- Annapolis, Maryland16
- Niagara Falls13
- Yellowstone National Park12
- Poland11
- Virginia11
- Washington Monument11
- North Carolina9
- Canada8