@article{Singer:136333,
      recid = {136333},
      author = {Singer, Mike A.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1993-02},
      number = {820-2016-53173},
      series = {1837},
      pages = {4},
      year = {1993},
      url = {http://ageconsearch.umn.edu/record/136333},
      doi = {https://doi.org/10.22004/ag.econ.136333},
}