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An Extension Program for Range Management and Range Livestock as Adopted at a Regional Extension Conference Held at Spokane, Wash., May 24-27, 1937
William Allison Lloyd
出版U.S. Department of Agriculture, 1938
URLhttp://books.google.com.hk/books?id=v7E3yEKgXAQC&hl=&source=gbs_api
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