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Selective Grazing by Sheep as Affected by the Structure and Composition of a Lolium Perenne and Trifolium Repens Sward

S. D. Mack

出版	Centre for Tropical Veterinary Medicine, University of Edinburgh, 1978
URL	http://books.google.com.hk/books?id=WnEVYAAACAAJ&hl=&source=gbs_api