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Author
Illinois State Geological Survey
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Shapefile
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Public
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Subject
Imagery and Base Maps
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Mixed
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1. Glacial Drift: Thickness and Character: Illinois, 2004
1994. Illinois State Geological Survey. This is an SDE feature dataset showing drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plat...