@article{159332,
      recid = {159332},
      author = {Berg, Richard B., and Masters, John M.},
      title = {Geology of microcrystalline silica (Tripoli) deposits,  southernmost Illinois /},
      publisher = {Illinois State Geological Survey,},
      address = {Champaign, Ill. :},
      pages = {89 p. :},
      year = {1994},
      url = {http://library.usi.edu/record/159332},
}