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Subject
- Topical Subject: IGS Annual Reports4
- Topical Subject: Coal2
- Geographic Subject: Clay County (Ind.)1
- Geographic Subject: Greene County (Ind.)1
- Geographic Subject: Indiana1
- Geographic Subject: Vermillion County (Ind.)1
- Geographic Subject: Vigo County (Ind.)1
- Topical Subject: Coal mines and mining1
- Topical Subject: Geology, Stratigraphic1
- Topical Subject: Iron mines and mining1
- Topical Subject: Lumber trade1
- Topical Subject: Mines and mineral resources1