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Region
- Montana23
- MontanaRosebud County10
- IdahoWallace Region2
- MontanaLincoln County2
- Powder River Basin (Wyo. and Mont.)2
- Belt Supergroup1
- Big Sky Mine (Mont.)1
- Clark Fork (Mont. and Idaho)1
- Fort Union Formation1
- Gallatin River Watershed (Wyo. and Mont.)1
- Glendive Region (Mont.)1
- Heath Formation (Mont. and N.D.)1
- Madison Group1
- Milk River Watershed (Mont. and Alta.)1
- Missouri River Watershed1
- MontanaBears Paw Mountains1
- MontanaBig Horn County1
- MontanaBoulder River Watershed (Sweet Grass County)1
- MontanaCarbon County1
- MontanaCuster County1