edited by Brandon Curry ; with contributions from Jason Thomason ... [and others] ; [sponsored by the Illinois State Geological Survey with the help of Northern Illinois University, the Illinois State Museum, and the University of Illinois--Chicago]
Date
2008
Series
Illinois State Geological Survey open file series ; 2008-1
based on Hansel and Johnson, 1996 ; revised from Lineback 1979, Killey and Lineback, 1983, Berg and others, 1984, and Berg and others, 1985 ; digitally adapted by Barbara J. Stiff
Date
2000
Series
Illinois State Geological Survey open file series ; 2000-7