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- Topical Subject: Geology[remove]43
- Topical Subject: IGS Annual Reports[remove]43
- Topical Subject: Mines and mineral resources18
- Geographic Subject: Indiana16
- Topical Subject: Coal10
- Topical Subject: Geology, Stratigraphic--Silurian6
- Topical Subject: Limestone6
- Geographic Subject: Lawrence County (Ind.)4
- 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: Monroe County (Ind.)3
- Geographic Subject: Putnam County (Ind.)3
- Geographic Subject: Bedford (Ind.)2
- Geographic Subject: Benton County (Ind.)2
- Geographic Subject: Bloomington (Ind.)2
- Geographic Subject: Dearborn County (Ind.)2
- Geographic Subject: Fayette County (Ind.)2