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Subject
- Topical Subject: IGS Annual Reports3
- Geographic Subject: Clark County (Ind.)2
- Topical Subject: Fortification2
- Topical Subject: Mines and mineral resources2
- Topical Subject: Mounds2
- Topical Subject: Stone walls2
- Geographic Subject: North Rhine-Westphalia (Germany)1
- Geographic Subject: Ohio River1
- Geographic Subject: Warren County (Ind.)1
- Topical Subject: Coal mines and mining1
- Topical Subject: Geology1
- Topical Subject: Rivers1