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You searched for: Date Created 1970 Remove constraint Date Created: 1970 Publisher Indiana. Geological Survey Remove constraint Publisher: Indiana. Geological Survey Subject Geographic Subject: Calumet Region (Ill. and Ind.) Remove constraint Subject: Geographic Subject: Calumet Region (Ill. and Ind.)

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