@article{9856,
      author = {Busch, Willis L.},
      url = {http://library.usi.edu/record/9856},
      title = {Mineral production in Illinois in 1969 /},
      publisher = {Illinois State Geological Survey,},
      recid = {9856},
      pages = {22 p. :},
      address = {Urbana :},
      year = {1971},
}