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Spatial Coverage
- Nevada14
- U.S.3
- California2
- Utah2
- Alaska1
- Culpeper Basin (Va. and Md.)1
- Fairbanks Region1
- Florida1
- Iowa1
- Iowa.1
- Logan County1
- Logan County (N.D.)1
- Maryland1
- Nevada.1
- North Dakota1
- Palm Beach County1
- Sierra Nevada (Calif. and Nev.)1
- Sierra Nevada Mountain (Calif. and Nev.)1
- Snake River Plain (Idaho and Or.)1
- Soviet Union1
