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Subject
- Topical Subject: Geology7
- Topical Subject: IGS Annual Reports[remove]7
- Topical Subject: Geology, Stratigraphic--Silurian5
- Geographic Subject: Decatur County (Ind.)3
- Geographic Subject: Jefferson County (Ind.)2
- Geographic Subject: Ripley County (Ind.)2
- Geographic Subject: Clark County (Ind.)1
- Geographic Subject: Dearborn County (Ind.)1
- Geographic Subject: Fayette County (Ind.)1
- Geographic Subject: Franklin County (Ind.)1
- Geographic Subject: Indiana1
- Geographic Subject: Jennings County (Ind.)1
- Geographic Subject: Ohio County (Ind.)1
- Geographic Subject: Switzerland County (Ind.)1
- Topical Subject: Geology, Stratigraphic--Ordovician1
- Topical Subject: Mines and mineral resources1