@article{Sharpe:286899,
      recid = {286899},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1969-02-28},
      series = {1002},
      month = {Feb},
      year = {1969},
      url = {http://ageconsearch.umn.edu/record/286899},
      doi = {https://doi.org/10.22004/ag.econ.286899},
}