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Subject (Region)
- National Zoological Park22
- Alaska, Department and District of (1867-1912)10
- Great Britain9
- Arctic8
- United States8
- Canal Zone7
- China7
- France7
- Panama7
- Panama Canal (Panama)7
- Antarctica6
- Arizona Territory (1863-1912)6
- Europe6
- Germany (to 1949; 1990- )6
- Japan6
- North America6
- Egypt5
- New Mexico Territory (1850-1912)5
- South America5
- Africa4