@article{158563,
      recid = {158563},
      author = {Kolpin, Dana W. and Burkart, M. R. and Thurman, E. M.},
      title = {Herbicides and nitrate in near-surface aquifers in the  midcontinental United States, 1991 /},
      publisher = {U.S. G.P.O. ;},
      address = {Washington :},
      pages = {v, 34 p. :},
      year = {1994},
      url = {http://library.usi.edu/record/158563},
}