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| basin-central gas type (1) |
| bituminous sands (1) |
| gas of shale strata (1) |
| oil (1) |
| oil shale (1) |
| shale oil (1) |
| tight sands (1) |
| basin-central gas type (1) |
| bituminous sands (1) |
| gas of shale strata (1) |
| oil (1) |
| oil shale (1) |
| shale oil (1) |
| tight sands (1) |