@article{Sharpe:286905,
      recid = {286905},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1969-04-11},
      series = {1008},
      month = {Apr},
      year = {1969},
      url = {http://ageconsearch.umn.edu/record/286905},
      doi = {https://doi.org/10.22004/ag.econ.286905},
}