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Subject (Region)
- United States1,258
- Canada32
- District of Columbia20
- Arctic10
- Japan9
- United States9
- Barro Colorado Island (Panama)7
- Panama City, Panama7
- Antarctica6
- Great Lakes6
- Alaska Territory (1912-1959)5
- Canal Zone Biological Area5
- Europe5
- France5
- Kings Point, New York5
- Arctic Ocean4
- Canal Zone4
- Great Britain4
- Panama4
- Virgin Islands4