@article{65552,
      note = {Cover title.},
      author = {Collinson, Charles William.},
      url = {http://library.usi.edu/record/65552},
      title = {Six charts showing biostratigraphic zones, and  correlations based on conodonts from the Devonian and  Mississippian rocks of the Upper Mississippi Valley},
      recid = {65552},
      pages = {32 p. :},
      address = {Urbana,},
      year = {1962},
}