@article{8699,
      author = {Heigold, Paul C.},
      url = {http://library.usi.edu/record/8699},
      title = {Notes on the earthquake of November 9, 1968, in southern  Illinois /},
      publisher = {Illinois State Geological Survey,},
      recid = {8699},
      pages = {16 p. :},
      address = {Urbana :},
      year = {1968},
}