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- Geographic Subject: Indiana19
- Topical Subject: IGS Annual Reports19
- Topical Subject: Geology, Stratigraphic16
- Topical Subject: Mines and mineral resources16
- Geographic Subject: Ohio3
- Topical Subject: Geology2
- Geographic Subject: Illinois1
- Geographic Subject: Kentucky1
- Topical Subject: Gas fields1
- Topical Subject: Gas wells1
- Topical Subject: Minerals1
- Topical Subject: Natural gas pipelines1
- Topical Subject: Petroleum1
- Topical Subject: Trenton Limestone1