@article{19718,
      note = {Cover title.},
      author = {Potter, Paul Edwin. and Simon, Jack Aaron,},
      url = {http://library.usi.edu/record/19718},
      title = {Anvil rock sandstone and channel cutouts of Herrin (no. 6)  coal in west-central Illinois},
      recid = {19718},
      pages = {12 p. :},
      address = {Urbana,},
      year = {1961},
}