@article{Benjamin:138422, recid = {138422}, author = {Benjamin, Gary L.}, title = {Agricultural Letter}, journal = {Agricultural Letter}, address = {1974-05}, number = {820-2016-53147}, series = {1272}, pages = {2}, year = {1974}, url = {http://ageconsearch.umn.edu/record/138422}, doi = {https://doi.org/10.22004/ag.econ.138422}, }