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Subject (Region)
- United States34
- California4
- European Union countries4
- Louisiana3
- États-Unis2
- Idaho2
- North America2
- San Francisco Bay Area2
- Alaska1
- Alaska, Southeast1
- Arizona1
- Atlantic Coast (U.S.)1
- Bitterroot National Forest (Mont. and Idaho)1
- Black Hills National Forest (S.D. and Wyo.)1
- British Columbia1
- California Desert National Conservation Area (Calif.)1
- Canada1
- Caribbean Area1
- Central Idaho Wilderness1
- Developing countries1