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Subject (Region)
- United States312
- California133
- San Francisco Bay Area12
- Developing countries8
- Alaska6
- California, Southern6
- Colorado6
- Earth6
- West (U.S.)6
- Arctic regions5
- Sierra Nevada (Calif. and Nev.)5
- China4
- Tropics4
- Central Valley (Valley)3
- East (U.S.)3
- El Niño Current3
- European Union countries3
- Illinois3
- North America3
- Pacific Ocean3