U.S. Department of Agriculture web site: By U.S. Department of Agriculture. Washington,D.C.: The agency. Site reviewed late July and early August 1997. 〈http://www.usda.gov/〉. 期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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U.S. Department of Agriculture web site: By U.S. Department of Agriculture. Washington,D.C.: The agency. Site reviewed late July and early August 1997. 〈http://www.usda.gov/〉.

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