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Subject (Region)
- North America10
- Southwest, New5
- United States5
- West (U.S.)3
- Colorado River2
- Colorado River (Colo.-Mexico)2
- Mexican-American Border Region2
- Mexico2
- New York (State)2
- Alaska1
- America1
- Bakken Formation1
- Buffalo1
- California1
- Chicago (Ill.)1
- Colorado River Valley (Colo.-Mexico)1
- Great Lakes (North America)1
- Hoover Dam1
- Hoover Dam (Ariz. and Nev.)1
- Minneapolis (Minn.)1