@article{Sharpe:286901,
      recid = {286901},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1969-03-14},
      series = {1004},
      month = {Mar},
      year = {1969},
      url = {http://ageconsearch.umn.edu/record/286901},
      doi = {https://doi.org/10.22004/ag.econ.286901},
}