@article{68437,
      note = {Two folded maps in pocket.},
      author = {Kolata, Dennis R.},
      url = {http://library.usi.edu/record/68437},
      title = {Lithostratigraphy and depositional environments of the  Maquoketa Group (Ordovician) in northern Illinois /},
      publisher = {Illinois State Geological Survey,},
      recid = {68437},
      pages = {49 p. :},
      address = {Champaign, Ill. :},
      year = {1983},
}