@article{33692,
      note = {"April, 1981."},
      author = {Roy, William R.,},
      url = {http://library.usi.edu/record/33692},
      title = {Coal fly ash : a review of the literature and proposed  classification system with emphasis on environmental  impacts /},
      publisher = {Illinois State Geological Survey,},
      recid = {33692},
      pages = {iv, 69 p. :},
      address = {Champaign, Ill. :},
      year = {1981},
}