@article{Benjamin:138076, recid = {138076}, author = {Benjamin, Gary L. and Miller, Jeffrey L.}, title = {Agricultural Letter}, journal = {Agricultural Letter}, address = {1981-09-18}, number = {820-2016-53215}, series = {1560}, pages = {4}, month = {Sep}, year = {1981}, url = {http://ageconsearch.umn.edu/record/138076}, doi = {https://doi.org/10.22004/ag.econ.138076}, }