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Thumbnail Icon [Parameters: Topic='LAND SURFACE', Term='EROSION/SEDIMENTATION', Variable_Level_1='SEDIMENTS', Detailed_Variable='GRAVEL']

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1. Coarse-grained Materials Within 50 Feet of the Ground Surface in Illinois [IGDNR_ALLST_AQ50]
This map shows the distribution of coarse-grained materials and permeable bedrock within 50 feet of ground surface in Illinois. This includes bedrock, sand and gravel, and alluvial units ...

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