@article{120403,
      author = {Nelson, W. John.},
      url = {http://library.usi.edu/record/120403},
      title = {The Hornsby district of low-sulfur Herrin coal in central  Illinois (Christian, Macoupin, Montgomery, and Sangamon  counties) /},
      publisher = {Illinois State Geological Survey,},
      recid = {120403},
      pages = {40 p. :},
      address = {Champaign, Ill. :},
      year = {1987},
}