Subject (Region)
- Japan21
- Montana21
- Georgia20
- North Pacific Ocean20
- Minnesota19
- North Carolina19
- Wisconsin19
- Wyoming19
- Colorado18
- Mexico18
- Northwest, Pacific18
- Pennsylvania18
- Alaska, Department and District of (1867-1912)17
- Great Lakes17
- Texas17
- South Carolina16
- Atlantic Ocean15
- Great Lakes (North America)15
- New Mexico15
- Potomac River15