@article{Maaske:286788,
      recid = {286788},
      author = {Maaske, David W.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1967-01-13},
      series = {891},
      month = {Jan},
      year = {1967},
      url = {http://ageconsearch.umn.edu/record/286788},
      doi = {https://doi.org/10.22004/ag.econ.286788},
}