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- Geographic Subject: Indiana[remove]58
- Topical Subject: IGS Annual Reports[remove]58
- Topical Subject: Geology, Stratigraphic22
- Topical Subject: Mines and mineral resources21
- Topical Subject: Geology16
- Topical Subject: Coal11
- Topical Subject: Road materials6
- Geographic Subject: Ohio4
- Topical Subject: Gas fields4
- Topical Subject: Geology, Stratigraphic--Ordovician4
- Geographic Subject: Dearborn County (Ind.)3
- Topical Subject: Gas wells3
- Topical Subject: Geology, Stratigraphic--Silurian3
- Topical Subject: Gravel3
- Topical Subject: Stratigraphic correlation3
- Geographic Subject: Bartholomew County (Ind.)2
- Geographic Subject: Clay County (Ind.)2
- Geographic Subject: Decatur County (Ind.)2
- Geographic Subject: Fountain County (Ind.)2
- Geographic Subject: Gibson County (Ind.)2