University of Illinois Urbana-Champaign

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Thumbnail for Mackinaw River area assessment.
Mackinaw River area assessment.
Illinois Department of Natural Resources

Thumbnail for Geology for planning in Boone and Winnebago Counties
Geology for planning in Boone and Winnebago Counties
Berg, Richard C.; Kempton, John Paul; Stecyk, Amy N.; Goodwin, Jonathan H.; Glockner, Mary