@article{20612,
      author = {Busch, Willis L. and Voskuil, Walter H.},
      url = {http://library.usi.edu/record/20612},
      title = {Mineral production in Illinois in 1956 /},
      publisher = {Illinois State Geological Survey,},
      recid = {20612},
      pages = {36 p. :},
      address = {Urbana, IL :},
      year = {1957},
}