Horwitz, William, editor
Association of Official Agricultural Chemists, 1955
Buku Referensi
Shepherd, Geoffrey S.
Iowa State University Press, 1968
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Paik, C. M., 1931-
McGraw-Hill, 1973
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Stermole, Franklin
Investment Evaluations Corp, 2014
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Piccolo, Alessandro, editor
Springer, 2012
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