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- Topical Subject: Geology[remove]12
- Geographic Subject: Indiana10
- Topical Subject: IGS Annual Reports10
- Topical Subject: Coal9
- Topical Subject: Mines and mineral resources3
- Geographic Subject: Clay County (Ind.)2
- Geographic Subject: Gibson County (Ind.)2
- Geographic Subject: Putnam 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: Daviess County (Ind.)1
- Geographic Subject: Dubois County (Ind.)1
- Geographic Subject: Fountain County (Ind.)1
- Geographic Subject: Greene County (Ind.)1
- Geographic Subject: Knox County (Ind.)1
- Geographic Subject: Lake County (Ind.)1
- Geographic Subject: Lawrence County (Ind.)1
- Geographic Subject: Martin County (Ind.)1