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Subject
- Topical Subject: IGS Annual Reports12
- Topical Subject: Mines and mineral resources7
- Topical Subject: Geology5
- Topical Subject: Geology, Economic4
- Geographic Subject: Daviess County (Ind.)3
- Topical Subject: Coal mines and mining3
- Geographic Subject: Clark County (Ind.)2
- Geographic Subject: Martin County (Ind.)2
- Geographic Subject: Sullivan County (Ind.)2
- Topical Subject: Geology, Stratigraphic2
- Geographic Subject: Floyd County (Ind.)1
- Geographic Subject: Illinois1
- Geographic Subject: Indiana1
- Geographic Subject: Jackson County (Ind.)1
- Geographic Subject: Kentucky1
- Geographic Subject: Lawrence County (Ind.)1
- Geographic Subject: Montgomery County (Ind.)1
- Geographic Subject: Ohio River1
- Geographic Subject: Vigo County (Ind.)1
- Topical Subject: Caves1