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Graf, W ,  Ndorehayo, V ,  [Agroforestry research in bean-based cropping systems of subsahalien Africa: A review of research methodologies and results] ,  Agroforestry research in bean-based cropping systems of subsahalien Africa: A review of research methodologies and results

Edje, O.T. ,  Semoka, JMR ,  Haule, KL ,  [Traditional forms of soil fertility maintenance] ,  Traditional forms of soil fertility maintenance