@article{Benjamin:137497,
      recid = {137497},
      author = {Benjamin, Gary L. and Heffernan, Peter J.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1987-05-22},
      number = {820-2016-52942},
      series = {1708},
      pages = {4},
      month = {May},
      year = {1987},
      url = {http://ageconsearch.umn.edu/record/137497},
      doi = {https://doi.org/10.22004/ag.econ.137497},
}