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You searched for: Creator Illinois State Geological Survey Remove constraint Creator: Illinois State Geological Survey Publisher Indiana. Geological Survey Remove constraint Publisher: Indiana. Geological Survey Subject Geographic Subject: Indiana, Northwest Remove constraint Subject: Geographic Subject: Indiana, Northwest

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  • Geological map of the 1¬¨‚àû x 2¬¨‚àû Chicago Quadrangle, Indiana, Illinois, and Michigan, showing bedrock and unconsolidated deposits