@article{155091,
      author = {Heigold, Paul C. and Larson, Timothy H.},
      url = {http://library.usi.edu/record/155091},
      title = {Seismicity of Illinois /},
      publisher = {Illinois State Geological Survey,},
      recid = {155091},
      pages = {20 p. :},
      address = {Champaign, Ill. :},
      year = {1990},
}