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Alfalfa Varieties in the United States

C. H. HansonCarlton Slaughter GarrisonHugo Oswalt Graumann

出版	Agriculture Research Service, U.S. Department of Agriculture, 1960
URL	http://books.google.com.hk/books?id=TjfcXSaiGLsC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN