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Preparation for the 1990 Farm Bill: The state of agricultural research and extension
United States. Congress. Senate. Committee on Agriculture, Nutrition, and Forestry
出版U.S. Government Printing Office, 1989
ISBN01603535139780160353512
URLhttp://books.google.com.hk/books?id=EXJKAQAAMAAJ&hl=&source=gbs_api
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