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Subject (Region)
- United States6
- Wyoming6
- Alabama4
- Powder River Basin4
- Powder River Basin (Wyo. and Mont.)4
- Wind River Basin3
- Mississippi2
- Texas2
- Wind River Basin (Wyo.)2
- Charleston Region1
- Colorado1
- Florida1
- Fremont County1
- Georgia1
- Mancos Shale1
- Mesaverde Group1
- Neshoba County1
- Piceance Creek Basin1
- San Juan Basin1
- San Juan Basin (N.M. and Colo.)1