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  • USDA (2002). A History of American Agriculture, 1776-1990: Agricultural Education and Extention. United States Department of Agriculture. http://www.usda.gov/history2/text10.htm. More generally: http://www.usda.gov/history2/front.htm. (xsd:string)
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  • U. S. D. (2002). A History of American Agriculture, 1776-1990: Agricultural Education and Extention. United States Department of Agriculture. (xsd:string)
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