@article{Sharpe:286885,
      recid = {286885},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1968-11-22},
      series = {988},
      month = {Nov},
      year = {1968},
      url = {http://ageconsearch.umn.edu/record/286885},
      doi = {https://doi.org/10.22004/ag.econ.286885},
}