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Effect of Nitrogen Levels and Stocking Rates on Profitability of Winter Grazing

Ned Carmack EdwardsE. G. MorrisonFred H. Tyner

出版	Mississippi Agricultural & Forestry Experiment Station, 1978
URL	http://books.google.com.hk/books?id=uk83zgEACAAJ&hl=&source=gbs_api