• publisher: Champaign, IL : Illinois State Geological Survey
  • creator: Nelson, W. John Weibel, C. Pius
  • contributor: Weibel, C. Pius.
  • Keyword: Geology Illinois Union County. Geology Illinois Williamson County. Geology Illinois Johnson County.
  • years: 1996.
  • pages: 39 p., 1 leaf of plates :
  • class: QE106.J64
  • download: pdf file