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Methods of Harvesting Hay and Silage Crops 1959 and Comparisons
Robert Cecil McElroyPaul Eugene Strickler
出版Farm Economics Division, Economic Research Service, U.S. Department of Agriculture, 1961
URLhttp://books.google.com.hk/books?id=C_EacqoPQxkC&hl=&source=gbs_api
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