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Spatial Coverage
- United States8
- Powder River Basin (Wyo. and Mont.)4
- Powder River Basin.4
- Appalachian Basin3
- Appalachian Basin.3
- Michigan Basin (Mich. and Ont.)2
- Michigan Basin.2
- North America2
- Ohio2
- San Juan Basin (N.M. and Colo.)2
- San Juan Basin.2
- Arizona1
- Belt Supergroup1
- Belt Supergroup.1
- California1
- Connecticut1
- Deer Lodge County1
- Deer Lodge County (Mont.)1
- Deer Lodge County.1
- Earth1
