@article{Sharpe:287023,
      recid = {287023},
      author = {Sharpe, Dennis B.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1971-09-03},
      series = {1133},
      month = {Sep},
      year = {1971},
      url = {http://ageconsearch.umn.edu/record/287023},
      doi = {https://doi.org/10.22004/ag.econ.287023},
}