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Origin, Composition and Utility of Fertilizing Materials

Andrew MacNairn SouleGeorge Thomas McNessRobert James DavidsonVirginia Agricultural Experiment StationBernard Guthrie AndersonJohn Richard FainErnest H. MathewsonMilton P. JarnaginPhares O. VanatterWalter Beal Ellett

出版	Virginia Agricultural Experiment Station, 1906
URL	http://books.google.com.hk/books?id=MGlRAQAAMAAJ&hl=&source=gbs_api