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You searched for: Creator Illinois State Geological Survey Remove constraint Creator: Illinois State Geological Survey Date Created 1970 Remove constraint Date Created: 1970 Subject Geographic Subject: Indiana, Northwest Remove constraint Subject: Geographic Subject: Indiana, Northwest State deposited Remove constraint State: deposited

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