@article{905801,
      author = {Clay, David and Shanahan, John Francis,},
      url = {http://library.usi.edu/record/905801},
      title = {GIS applications in agriculture., Volume two,: Nutrient  management for energy efficiency [electronic resource] /},
      publisher = {CRC Press,},
      recid = {905801},
      pages = {xviii, 443 p. :},
      address = {Boca Raton, FL :},
      year = {2011},
}