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Subject (Region)
- United States529
- Canada14
- Great Britain10
- California7
- Southwestern States7
- Black Hills National Forest6
- Black Hills National Forest (S.D. and Wyo.)6
- North America6
- Sierra Nevada6
- Sierra Nevada (Calif. and Nev.)6
- Japan5
- New Mexico5
- West (U.S.)5
- Klamath National Forest4
- Klamath National Forest (Calif. and Or.)4
- Mexico4
- Oklahoma4
- Southern States4
- Texas4
- Washington (State)4