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Agricultural studies for Lesotho : from subsistence to self-sufficiency
Maes, Y. M., (1978)
Regional fluctuations in Rumanian agriculture : a case study of grain production, 1956-1966
Thomas, C., (1974)
L ʹimportance économique des produits vivriers de base en Côte dʹIvoire
Kouadio, Boni, (1976)