@article{Singer:136743,
      recid = {136743},
      author = {Singer, Mike A.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1991-12},
      number = {820-2016-53353},
      series = {1823},
      pages = {4},
      year = {1991},
      url = {http://ageconsearch.umn.edu/record/136743},
      doi = {https://doi.org/10.22004/ag.econ.136743},
}