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Subject
- Topical Subject: IGS Annual Reports6
- Topical Subject: Geology4
- Geographic Subject: Perry County (Ind.)2
- Topical Subject: Coal2
- Topical Subject: Mines and mineral resources2
- Geographic Subject: Clay County (Ind.)1
- Geographic Subject: Decatur County (Ind.)1
- Geographic Subject: Fayette County (Ind.)1
- Geographic Subject: Franklin County (Ind.)1
- Geographic Subject: Indiana1
- Geographic Subject: Lake County (Ind.)1
- Geographic Subject: Porter County (Ind.)1
- Geographic Subject: Spencer County (Ind.)1
- Geographic Subject: Warrick County (Ind.)1
- Topical Subject: Brazil Block Coal Company1
- Topical Subject: Coal mines and mining1
- Topical Subject: Gas fields1
- Topical Subject: Gas pipelines1
- Topical Subject: Gas wells1
- Topical Subject: Landforms1