@article{Sloan:287000,
      recid = {287000},
      author = {Sloan, Roby},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1971-03-12},
      series = {1108},
      month = {Mar},
      year = {1971},
      url = {http://ageconsearch.umn.edu/record/287000},
      doi = {https://doi.org/10.22004/ag.econ.287000},
}