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The Effect of Green-Manure Crops on Certain Properties of Berks Silt Loam
Samuel Shockley ObenshainVirginia Polytechnic Institute. Agricultural Experiment StationPeyton Terry Gish
出版Virginia Agricultural Experiment Station, 1941
URLhttp://books.google.com.hk/books?id=bFw2zgEACAAJ&hl=&source=gbs_api