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- Topical Subject: Geology[remove]103
- Topical Subject: IGS Annual Reports58
- Geographic Subject: Indiana49
- Topical Subject: Mines and mineral resources41
- Topical Subject: Geology, Stratigraphic21
- Topical Subject: Coal11
- Topical Subject: Coal mines and mining9
- Topical Subject: Limestone9
- Geographic Subject: Illinois7
- Geographic Subject: Monroe County (Ind.)6
- Topical Subject: Geology, Stratigraphic--Silurian6
- Topical Subject: Soils6
- Geographic Subject: Lawrence County (Ind.)5
- Geographic Subject: Clark County (Ind.)4
- Geographic Subject: Fountain County (Ind.)4
- Geographic Subject: Gibson County (Ind.)4
- Geographic Subject: Owen County (Ind.)4
- Geographic Subject: Clay County (Ind.)3
- Geographic Subject: Dearborn County (Ind.)3
- Geographic Subject: Decatur County (Ind.)3