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Subject
- Topical Subject: IGS Annual Reports7
- Topical Subject: Shale5
- Topical Subject: Clay4
- Topical Subject: Clay industries4
- Geographic Subject: Parke County (Ind.)3
- Topical Subject: Mines and mineral resources2
- Geographic Subject: Brazil (Ind.)1
- Geographic Subject: Bridgeton Region (Ind.)1
- Geographic Subject: Dubois County (Ind.)1
- Geographic Subject: Fountain County (Ind.)1
- Geographic Subject: Huntingburg Region (Ind.)1
- Geographic Subject: Mecca Region (Ind.)1
- Geographic Subject: Montezuma (Ind.)1
- Geographic Subject: Veedersburg City Region (Ind.)1
- Geographic Subject: Vermillion County (Ind.)1
- Geographic Subject: Vigo County (Ind.)1