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Subject (Region)
- Mississippi River49
- District of Columbia22
- Washington Aqueduct (District of Columbia)21
- Washington Monument18
- White House16
- Great Lakes15
- Missouri River13
- United States12
- Yellowstone National Park10
- California6
- Lower Atchafalaya River (Louisiana)5
- New York Harbor5
- Red River4
- Mount Rainier National Park (Washington)3
- Alaska Territory (1912-1959)2
- Des Plaines River (Illinois/Wisconsin)2
- Hawaii Territory (1898-1959)2
- Illinois River (IIlinois)2
- Lockport, Illinois2
- Niagara Falls2