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- Topical Subject: Geology, Stratigraphic[remove]15
- Geographic Subject: Indiana12
- Topical Subject: Geology12
- Geographic Subject: Illinois7
- Geographic Subject: Ohio3
- Topical Subject: Coal3
- Topical Subject: IGS Annual Reports3
- Geographic Subject: Michigan2
- Geographic Subject: Posey County (Ind.)2
- Geographic Subject: Calumet Region (Ill. and Ind.)1
- Geographic Subject: Daviess County (Ind.)1
- Geographic Subject: Indiana, Northwest1
- Geographic Subject: Kentucky1
- Topical Subject: Coal mines and mining1