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Spatial Coverage
- Alaska116
- United States5
- Portugal4
- Colorado2
- Montana2
- Montana.2
- New Hampshire2
- North Dakota2
- North Dakota.2
- Soviet Union2
- Soviet Union.2
- Virginia2
- Washington (State)2
- Apple Valley (Calif.)1
- Arizona1
- Badlands National Park (S.D.)1
- Black Hills (S.D. and Wyo.)1
- Black Hills National Forest (S.D. and Wyo.)1
- Black Hills National Forest.1
- Chattahoochee National Forest1
