@article{19331,
      author = {Willman, H. B. and Reynolds, Robert Ramon,},
      url = {http://library.usi.edu/record/19331},
      title = {Geological structure of the zinc-lead district of  northwestern Illinois /},
      publisher = {State Geological Survey,},
      recid = {19331},
      pages = {15 p. :},
      address = {Urbana, Ill. :},
      year = {1947},
}