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Subject
- Geographic Subject: Indiana5
- Topical Subject: Coal5
- Topical Subject: IGS Annual Reports5
- Topical Subject: Geology, Stratigraphic3
- Topical Subject: Soils3
- Topical Subject: Geology2
- Geographic Subject: Clay County (Ind.)1
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Dubois County (Ind.)1
- Geographic Subject: Perry County (Ind.)1
- Topical Subject: Coal mines and mining1
- Topical Subject: Coal reserves1
- Topical Subject: Mines and mineral resources1
- Topical Subject: Startigraphic correlation1
- Topical Subject: Stratigraphic correlation1