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Subject
- Topical Subject: IGS Annual Reports6
- Geographic Subject: Dearborn County (Ind.)2
- Geographic Subject: Hamilton County (Ohio)2
- Geographic Subject: New Garden (Ind. : Township)2
- Geographic Subject: Wyandotte Cave (Ind.)2
- Topical Subject: Caves2
- Topical Subject: Coal mines and mining2
- Topical Subject: Fortification, Prehistoric2
- Topical Subject: Geology2
- Topical Subject: Mines and mineral resources2
- Topical Subject: Mounds2
- Geographic Subject: Cambridge City (Ind.)1
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Harrison County (Ind.)1
- Topical Subject: Corydon Capitol (Corydon, Ind.)1
- Topical Subject: Earthworks (Archaeology)1
- Topical Subject: Henges1
- Topical Subject: Indians of North America1
- Topical Subject: Speleothems1