@article{Maaske:286790,
      recid = {286790},
      author = {Maaske, David W.},
      title = {Agricultural Letter},
      journal = {Agricultural Letter},
      address = {1967-01-27},
      series = {893},
      month = {Jan},
      year = {1967},
      url = {http://ageconsearch.umn.edu/record/286790},
      doi = {https://doi.org/10.22004/ag.econ.286790},
}