20231218 18191900 1.0 TRUE Geological and Geophysical Maps of the Illinois Basin-Ozark Dome Region geology topography surficial bedrock contours shaded relief elevation isostatic gravity anomaly magnetic anomaly faults folds earthquake epicenters Missouri Illinois Indiana Kentucky Geological and Geophysical Maps of the Illinois Basin-Ozark Dome Region Illinois State Geological Survey, Prairie Research Institute, Univeristy of Illinois Urbana-Champaign Geological and Geophysical Maps of the Illinois Basin-Ozark Dome Region 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