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Subject (Region)
- Alaska3
- Anadarko Basin2
- Arkansas River Valley1
- Aux Vases Formation1
- California2
- Canada1
- Colorado1
- Front Range1
- Front Range (Colo. and Wyo.)1
- Green River Formation1
- Gulf States1
- Illinois Basin3
- New Albany Shale1
- New Albany Shale (Ind. and Ky.)1
- Pacific Coast3
- Pacific Coast (U.S.)3
- Pacific Ocean1
- Paradox Basin1
- Paradox Formation1
- Permian Basin (Tex. and N.M.)1