@article{125099,
      note = {Four maps on folded sheets in pocket.},
      author = {Berg, Richard C. and Kempton, John P.},
      url = {http://library.usi.edu/record/125099},
      title = {Stack-unit mapping of geologic materials in Illinois to a  depth of 15 meters /},
      publisher = {Illinois State Geological Survey,},
      recid = {125099},
      pages = {23 p. :},
      address = {Champaign, Illinois :},
      year = {1988},
}