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Illinois
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1996
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1. Bedrock Geology of Illinois - Geologic Units, 2004
1996. Illinois State Geological Survey. This feature class shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the Geologic Map of...
2. One-Hundred and Five-Hundred Year Floodzones for Unincorporated Areas: Illinois, 2006
1996. Illinois State Water Survey. This feature class was quickly assembled from old Arc/Info coverages to produce a general graphic image and has not reviewed or quality-controlled ...
3. Quaternary Deposits: Illinois, 1996
1996. Barb Stiff. This feature dataset is a generalized version of Quaternary Deposits of Illinois. Updated to reflect the areal distribution of the Wedron and Mason...