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Subject (Region)
- Alaska2
- Anadarko Basin1
- Arizona1
- Arkansas1
- Brooks Range1
- Brooks Range (Alaska)1
- Cades Cove1
- California1
- Canada1
- Chichagof Island1
- Colorado1
- Colorado River (Colo.-Mexico)1
- Klamath Mountains (Calif. and Or.)1
- Long Island Sound (N.Y. and Conn.)1
- Middle West1
- Mississippi County1
- Missouri1
- Montana1
- Nevada1
- Nevada Test Site1