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Item Number: RGM04A
Map Scale: 1:250,000

Schneider, A. F., and Keller, S. J., 1970, Geologic map of the 1° x 2° Chicago quadrangle, Indiana, Illinois, and Michigan showing bedrock and unconsolidated deposits: Indiana Geological Survey Regional Geologic Map No. 4A, Chicago Sheet, Part A, scale 1:250,000.

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Keywords: geologic map, bedrock

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