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Subject
- Geographic Subject: Indiana42
- Topical Subject: IGS Annual Reports32
- Topical Subject: Geology29
- Topical Subject: Coal mines and mining19
- Topical Subject: Mines and mineral resources18
- Topical Subject: Geology, Stratigraphic15
- Geographic Subject: Illinois8
- Topical Subject: Coal7
- Topical Subject: Caves5
- Topical Subject: Geology, Economic4
- Topical Subject: Mounds4
- Geographic Subject: Clark County (Ind.)3
- Geographic Subject: Daviess County (Ind.)3
- Geographic Subject: Indiana, Northwest3
- Geographic Subject: Michigan3
- Geographic Subject: Ohio3
- Geographic Subject: Posey County (Ind.)3
- Geographic Subject: Calumet Region (Ill. and Ind.)2
- Geographic Subject: Dearborn County (Ind.)2
- Geographic Subject: Hamilton County (Ohio)2