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Subject (Region)
- United States247
- Developing countries4
- Mexican-American Border Region3
- Mexico3
- Southwestern States2
- Texas2
- United States2
- - Developing countries1
- California1
- Capitol Hill (Washington, D.C.)1
- Clark Fork (Mont. and Idaho)1
- East Liverpool1
- Europe, Eastern1
- Garland1
- Great Lakes (North America)1
- Great Smoky Mountains National Park (N.C. and Tenn.)1
- Hopewell1
- Idaho1
- Libby1
- Montana1