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Subject (Region)
- United States10
- District of Columbia8
- Costa Rica3
- Nicaragua3
- Nicaragua Canal (Nicaragua)3
- Colorado2
- Denmark1
- Dismal Swamp Canal (Virginia)1
- Great Britain1
- Great Dismal Swamp (North Carolina/Virginia)1
- Manila, Philippines1
- Maryland1
- North Carolina1
- Norway1
- Samoa, American (1899- )1
- San Juan River (Nicaragua)1
- San Juan del Norte, Nicaragua1
- Swains Island (American Samoa)1
- Uintah and Ouray Indian Reservation (Utah)1
- Utah1