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- Geographic Subject: Indiana[remove]69
- Topical Subject: IGS Annual Reports58
- Topical Subject: Geology, Stratigraphic28
- Topical Subject: Mines and mineral resources25
- Topical Subject: Geology21
- Topical Subject: Coal12
- Topical Subject: Road materials6
- Geographic Subject: Ohio4
- Topical Subject: Gas fields4
- Topical Subject: Geology, Stratigraphic--Ordovician4
- Geographic Subject: Dearborn County (Ind.)3
- Topical Subject: Coal mines and mining3
- Topical Subject: Gas wells3
- Topical Subject: Geology, Stratigraphic--Silurian3
- Topical Subject: Gravel3
- Topical Subject: Limestone3
- Topical Subject: Oil fields3
- Topical Subject: Stratigraphic correlation3
- Geographic Subject: Bartholomew County (Ind.)2
- Geographic Subject: Clay County (Ind.)2