@article{155187,
      author = {Willman, H. B. and Glass, H. D. and Frye, John C.},
      url = {http://library.usi.edu/record/155187},
      title = {Glaciation and origin of the geest in the Driftless Area  of northwestern Illinois /},
      publisher = {Illinois State Geological Survey,},
      recid = {155187},
      pages = {v, 44 p. :},
      address = {Champaign, Ill. :},
      year = {1989},
}