@article{Sharpe:286989,
      recid = {286989},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1970-12-18},
      series = {1096},
      month = {Dec},
      year = {1970},
      url = {http://ageconsearch.umn.edu/record/286989},
      doi = {https://doi.org/10.22004/ag.econ.286989},
}