In copyright. Digitized with permission of the University of Illinois Board of Trustees. Contact dcc@library.uiuc.edu for information.
associated names
Harrison, Richard W; Hoffman, David; Illinois State Geological Survey; University of Illinois at Urbana-Champaign. Dept. of Geology; Geological Survey (U.S.). Water Resources Division; Geological Society of America. North-Central Section. Meeting. (33rd : 1999 : Champaign, Ill., and Urbana, Ill.)
