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Includes Illinois State Geological Survey (ISGS) publications on the mining and processing of nonfuel industrial and metallic minerals and rocks in the state.
Includes Illinois State Geological Survey (ISGS) publications on the mining and processing of nonfuel industrial and metallic minerals and rocks in the state.
Includes Illinois State Geological Survey (ISGS) publications on the mining and processing of nonfuel industrial and metallic minerals and rocks in the state.