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- Topical Subject: Mines and mineral resources[remove]70
- Topical Subject: IGS Annual Reports56
- Topical Subject: Geology41
- Geographic Subject: Indiana29
- Topical Subject: Geology, Stratigraphic22
- Topical Subject: Coal mines and mining8
- Topical Subject: Soils6
- Topical Subject: Geology, Economic4
- Geographic Subject: Fountain County (Ind.)3
- Geographic Subject: Martin County (Ind.)3
- Geographic Subject: Ohio3
- Topical Subject: Coal3
- Geographic Subject: Clark County (Ind.)2
- Geographic Subject: Clay County (Ind.)2
- Geographic Subject: Daviess County (Ind.)2
- Geographic Subject: Fayette County (Ind.)2
- Geographic Subject: Floyd County (Ind.)2
- Geographic Subject: Harrison County (Ind.)2
- Geographic Subject: Knox County (Ind.)2
- Geographic Subject: Monroe County (Ind.)2