@article{5292,
      author = {Stevenson, D. L.},
      url = {http://library.usi.edu/record/5292},
      title = {Insoluble residues of the Sauk sequence (Cambrian and  lower Ordovician) rocks of the Fairfield basin, Illinois :  an aid in correlation and in petroleum exploration /},
      publisher = {Illinois State Geological Survey,},
      recid = {5292},
      pages = {12 p. :},
      address = {Urbana :},
      year = {1975},
}