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Subject
- Topical Subject: IGS Annual Reports[remove]143
- Geographic Subject: Indiana58
- Topical Subject: Geology43
- Topical Subject: Mines and mineral resources38
- Topical Subject: Geology, Stratigraphic30
- Topical Subject: Coal13
- Topical Subject: Road materials11
- Topical Subject: Lakes10
- Topical Subject: Coal reserves9
- Topical Subject: Gas wells7
- Topical Subject: Geology, Stratigraphic--Silurian7
- Topical Subject: Limestone7
- Geographic Subject: Clay County (Ind.)6
- Geographic Subject: Decatur County (Ind.)6
- Geographic Subject: Pike County (Ind.)6
- Topical Subject: Oil wells6
- Topical Subject: Shale6
- Topical Subject: Stratigraphic correlation6
- Geographic Subject: Fountain County (Ind.)5
- Geographic Subject: Jefferson County (Ind.)5