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Subject (Region)
- United States[remove]65
- Wyoming4
- Alaska3
- Illinois Basin3
- Pacific Coast3
- Pacific Coast (U.S.)3
- Anadarko Basin2
- California2
- Paradox Basin2
- Powder River Basin2
- Powder River Basin (Wyo. and Mont.)2
- San Juan Basin2
- San Juan Basin (N.M. and Colo.)2
- Shoshone National Forest (Wyo.)2
- Arkansas River Valley1
- Aux Vases Formation1
- Canada1
- Colorado1
- Front Range1
- Front Range (Colo. and Wyo.)1