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Subject (Region)
- United States294
- France71
- District of Columbia43
- Spain40
- Washington Aqueduct (District of Columbia)36
- Mississippi River33
- Great Lakes29
- Great Britain27
- Italy26
- Soviet Union23
- Germany17
- China16
- Annapolis, Maryland15
- Niagara Falls13
- Yellowstone National Park12
- Poland11
- Virginia11
- Washington Monument11
- North Carolina9
- Canada8