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Subject
- Topical Subject: Geology[remove]53
- Topical Subject: IGS Annual Reports43
- Topical Subject: Mines and mineral resources26
- Geographic Subject: Indiana21
- Topical Subject: Coal10
- Topical Subject: Limestone9
- Topical Subject: Geology, Stratigraphic7
- Topical Subject: Geology, Stratigraphic--Silurian6
- Geographic Subject: Lawrence County (Ind.)4
- Geographic Subject: Monroe County (Ind.)4
- Topical Subject: Soils4
- Geographic Subject: Clark County (Ind.)3
- Geographic Subject: Clay County (Ind.)3
- Geographic Subject: Decatur County (Ind.)3
- Geographic Subject: Fountain County (Ind.)3
- Geographic Subject: Jefferson County (Ind.)3
- Geographic Subject: Owen County (Ind.)3
- Geographic Subject: Putnam County (Ind.)3
- Topical Subject: Abandoned quarries3
- Geographic Subject: Bedford (Ind.)2