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Thomas, Richard J. ,  Craswell, E.T. ,  [Integrated natural resource management: the approach of the soil, water and nutrient management program] ,  Integrated natural resource management: the approach of the soil, water and nutrient management program

Thomas, Richard J. ,  Fisher, Myles J. ,  Ayarza, Miguel Angel ,  Sanz Scovino, José Ignacio ,  [Productivity of acid tropical soils in Latin America and the role of forage grasses and legumes] ,  Productivity of acid tropical soils in Latin America and the role of forage grasses and legumes