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- Subject: IGS Annual Reports2
- Geographic Subject: Crawford County (Ind.)1
- Geographic Subject: Dearborn County (Ind.)1
- Geographic Subject: Hamilton County (Ohio)1
- Geographic Subject: Wyandotte Cave (Ind.)1
- Subject: Caves1
- Subject: Coal mines and mining1
- Subject: Fortification, Prehistoric1
- Subject: Geology1
- Subject: Indians of North America1
- Subject: Mines and mineral resources1
- Subject: Mounds1