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Subject
- Topical Subject: Coal mines and mining[remove]19
- Topical Subject: IGS Annual Reports9
- Geographic Subject: Indiana8
- Topical Subject: Geology7
- Topical Subject: Mines and mineral resources6
- Geographic Subject: Vermillion County (Ind.)2
- Geographic Subject: Vigo County (Ind.)2
- Geographic Subject: Warren County (Ind.)2
- Topical Subject: Coal2
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Daviess County (Ind.)1
- Geographic Subject: Fountain County (Ind.)1
- Geographic Subject: Harrison County (Ind.)1
- Geographic Subject: Montgomery County (Ind.)1
- Geographic Subject: Owen County (Ind.)1
- Geographic Subject: Spencer County (Ind.)1
- Geographic Subject: Vanderburgh County (Ind.)1
- Geographic Subject: Wyandotte Cave (Ind.)1
- Topical Subject: Caves1
- Topical Subject: Coal-fired power plants1