@article{Sharpe:286987,
      recid = {286987},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1970-12-04},
      series = {1094},
      month = {Dec},
      year = {1970},
      url = {http://ageconsearch.umn.edu/record/286987},
      doi = {https://doi.org/10.22004/ag.econ.286987},
}