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Subject
- Topical Subject: IGS Annual Reports[remove]14
- Topical Subject: Mines and mineral resources12
- Topical Subject: Geology8
- Topical Subject: Coal mines and mining7
- Topical Subject: Geology, Economic4
- Topical Subject: Caves3
- Geographic Subject: Daviess County (Ind.)2
- Geographic Subject: Martin County (Ind.)2
- Geographic Subject: Sullivan County (Ind.)2
- Geographic Subject: Wyandotte Cave (Ind.)2
- Geographic Subject: Brown County (Ind.)1
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Harrison County (Ind.)1
- Geographic Subject: Lawrence County (Ind.)1
- Geographic Subject: Montgomery County (Ind.)1
- Geographic Subject: Owen County (Ind.)1
- Geographic Subject: Vanderburgh County (Ind.)1
- Geographic Subject: Vermillion County (Ind.)1
- Geographic Subject: Vigo County (Ind.)1
- Geographic Subject: Warren County (Ind.)1