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Subject (Region)
- United States31
- Arizona2
- Challis National Forest2
- Challis National Forest (Idaho)2
- Idaho2
- North America2
- Northwest, Pacific2
- Oregon2
- Wyoming2
- Africa, West1
- Alaska, Southeast1
- Arctic regions1
- Ashley National Forest (Utah and Wyo.)1
- British Columbia1
- California1
- Canada1
- Colorado1
- Delta1
- Developing countries1
- European Union countries1