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- Topical Subject: IGS Annual Reports[remove]180
- Geographic Subject: Indiana64
- Topical Subject: Geology58
- Topical Subject: Mines and mineral resources56
- Topical Subject: Geology, Stratigraphic34
- Topical Subject: Coal16
- Topical Subject: Road materials11
- Topical Subject: Coal mines and mining10
- Topical Subject: Lakes10
- Topical Subject: Coal reserves9
- Geographic Subject: Clay County (Ind.)7
- Geographic Subject: Vigo County (Ind.)7
- Topical Subject: Gas wells7
- Topical Subject: Geology, Stratigraphic--Silurian7
- Topical Subject: Limestone7
- Geographic Subject: Daviess County (Ind.)6
- Geographic Subject: Decatur County (Ind.)6
- Geographic Subject: Fountain County (Ind.)6
- Geographic Subject: Jefferson County (Ind.)6
- Geographic Subject: Lawrence County (Ind.)6