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Subject
- Topical Subject: IGS Annual Reports143
- Geographic Subject: Indiana69
- Topical Subject: Geology53
- Topical Subject: Mines and mineral resources46
- Topical Subject: Soils42
- Topical Subject: Geology, Stratigraphic36
- Topical Subject: Coal15
- Topical Subject: Limestone12
- Topical Subject: Road materials12
- Topical Subject: Lakes11
- Topical Subject: Coal reserves10
- Geographic Subject: Monroe County (Ind.)9
- Geographic Subject: Owen County (Ind.)8
- Geographic Subject: Pike County (Ind.)7
- Topical Subject: Gas wells7
- Topical Subject: Geology, Stratigraphic--Silurian7
- Geographic Subject: Clay County (Ind.)6
- Geographic Subject: Decatur County (Ind.)6
- Geographic Subject: Greene County (Ind.)6
- Geographic Subject: Lawrence County (Ind.)6