The geology of Hardin County, and the adjoining part of Pope County,
by Stuart Weller, with the collaboration of Charles Butts, L.W. Currier, and R.D. Salisbury: in cooperation with the United States Geological Survey.
Illinois State Geological Survey Bulletin No. 41
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Full view Illinois State Geological Survey Bulletin No. 41 | University of Illinois at Urbana-Champaign |