« Previous
Next »
Subject
- Topical Subject: Coal[remove]7
- Geographic Subject: Indiana4
- Topical Subject: Geology, Stratigraphic3
- Topical Subject: IGS Annual Reports3
- Topical Subject: Coal mines and mining2
- Geographic Subject: Clay County (Ind.)1
- Geographic Subject: Illinois1
- Geographic Subject: Kentucky1
- Geographic Subject: Posey County (Ind.)1
- Geographic Subject: Spencer County (Ind.)1
- Topical Subject: Coal-fired power plants1
- Topical Subject: Geology1
- Topical Subject: Mines and mineral resources1