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- Topical Subject: Geology, Stratigraphic[remove]36
- Topical Subject: IGS Annual Reports30
- Geographic Subject: Indiana28
- Topical Subject: Mines and mineral resources21
- Topical Subject: Coal reserves10
- Topical Subject: Geology7
- Topical Subject: Coal4
- Topical Subject: Coalfields4
- Geographic Subject: Ohio3
- Topical Subject: Coal mines and mining3
- Topical Subject: Limestone2
- Topical Subject: Startigraphic correlation2
- Topical Subject: Stratigraphic correlation2
- Geographic Subject: Clay County (Ind.)1
- Geographic Subject: Daviess County (Ind.)1
- Geographic Subject: Dearborn County (Ind.)1
- Geographic Subject: Illinois1
- Geographic Subject: Jefferson (Ind. : Township)1
- Geographic Subject: Kentucky1
- Geographic Subject: Martin County (Ind.)1