@article{Benjamin:137316,
      recid = {137316},
      author = {Benjamin, Gary L. and Heffernan, Peter J.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1989-06-30},
      number = {820-2016-53001},
      series = {1763},
      pages = {4},
      month = {Jun},
      year = {1989},
      url = {http://ageconsearch.umn.edu/record/137316},
      doi = {https://doi.org/10.22004/ag.econ.137316},
}