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2by Guenzi, W.D., Soil Science Society of America, Madison, Wis. eng, Ahlrichs, J.L., Bloodworth, M.E., Chesters, G., Nash, A.G. (ed.)
Published 1974Texto bibliotecaFAO IT -
3by Wilde, S.A., North Carolina State Univ., Raleigh (USA). International Soil Fertility Evaluation and Improvement Program eng, Voigt, G.K., Iyer, J.G., Chesters, G.
Published 1972Texto bibliotecaFAO IT