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Subject
- Geographic Subject: Indiana6
- Topical Subject: Geology6
- Topical Subject: IGS Annual Reports5
- Topical Subject: Coal4
- Topical Subject: Mines and mineral resources3
- Geographic Subject: Orange County (Ind.)2
- Geographic Subject: Perry County (Ind.)2
- Geographic Subject: Spencer County (Ind.)2
- Geographic Subject: Warrick County (Ind.)2
- Topical Subject: Coal mines and mining2
- Topical Subject: Geology, Stratigraphic2
- Geographic Subject: Benton County (Ind.)1
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Dubois County (Ind.)1
- Geographic Subject: Fountain County (Ind.)1
- Geographic Subject: Gibson County (Ind.)1
- Geographic Subject: Montgomery County (Ind.)1
- Geographic Subject: Newton County (Ind.)1
- Geographic Subject: Parke County (Ind.)1
- Geographic Subject: Pike County (Ind.)1