Subject
- Topical Subject: Abandoned quarries4
- Topical Subject: Clay4
- Topical Subject: Clay industries4
- Topical Subject: Coal mines and mining4
- Topical Subject: Coalfields4
- Topical Subject: Gas fields4
- Topical Subject: Geology, Stratigraphic--Ordovician4
- Topical Subject: Oil fields4
- Geographic Subject: Bartholomew County (Ind.)3
- Geographic Subject: Bedford (Ind.)3
- Geographic Subject: Bloomington (Ind.)3
- Geographic Subject: Daviess County (Ind.)3
- Geographic Subject: Dubois County (Ind.)3
- Geographic Subject: Floyd County (Ind.)3
- Geographic Subject: Posey County (Ind.)3
- Geographic Subject: Putnam County (Ind.)3
- Geographic Subject: Sullivan County (Ind.)3
- Geographic Subject: Switzerland County (Ind.)3
- Geographic Subject: Warren County (Ind.)3
- Geographic Subject: Wayne County (Ind.)3