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- Topical Subject: Coal[remove]23
- Geographic Subject: Indiana17
- Topical Subject: IGS Annual Reports16
- Topical Subject: Geology11
- Topical Subject: Geology, Stratigraphic7
- Topical Subject: Coal mines and mining4
- Geographic Subject: Clay County (Ind.)3
- Geographic Subject: Perry County (Ind.)3
- Geographic Subject: Spencer County (Ind.)3
- Topical Subject: Mines and mineral resources3
- Geographic Subject: Gibson County (Ind.)2
- Geographic Subject: Posey County (Ind.)2
- Geographic Subject: Putnam County (Ind.)2
- Geographic Subject: Warrick County (Ind.)2
- Topical Subject: Startigraphic correlation2
- Geographic Subject: Benton County (Ind.)1
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Daviess County (Ind.)1
- Geographic Subject: Dubois County (Ind.)1
- Geographic Subject: Fountain County (Ind.)1