@article{20498,
      recid = {20498},
      author = {Schaefer, Mark.},
      title = {Research summary : acid rain /},
      publisher = {EPA,},
      address = {Wash., D.C. :},
      pages = {23 p. :},
      year = {1979},
      note = {October 1979.},
      url = {http://library.usi.edu/record/20498},
}