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Brosnan, K., & Blackwell, J.  (2016, April 05). Agriculture, Food, and the Environment. Oxford Research Encyclopedia of American History. Ed.   Retrieved 18 Sep. 2018, from http://americanhistory.oxfordre.com/view/10.1093/acrefore/9780199329175.001.0001/acrefore-9780199329175-e-179.