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Subject (Region)
- North America35
- Mexican-American Border Region8
- United States5
- Colorado River3
- Colorado River (Colo.-Mexico)3
- Mexico2
- Bakken Formation1
- Bermuda Islands1
- Caribbean Area1
- Cascade Range1
- Hoover Dam1
- Hoover Dam (Ariz. and Nev.)1
- Lake Superior Region1
- New Southwest1
- North Dakota1
- Northwest, Pacific1
- Pacific Northwest1
- Southwest, New1
- Stanley1
- Stanley (N.D.)1