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Subject (Region)
- National Zoological Park12
- Antarctica4
- Arctic4
- Europe4
- North America4
- Africa3
- Alaska, Department and District of (1867-1912)3
- Asia3
- Canal Zone Biological Area3
- Denmark3
- France3
- Great Britain3
- Japan3
- Latin America3
- Middle East3
- Arizona Territory (1863-1912)2
- China2
- Hawaii Territory (1898-1959)2
- Iceland2
- Mesopotamia (Region)2