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Agronomy --- anno 1930-1939 --- anno 1980-1989 --- Developing countries --- Mali --- Sahel --- Irrigation --- Agriculture --- Economic aspects --- History --- Mali. --- -Agriculture --- -Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Water in agriculture --- Chemigation --- -History --- -Economic aspects --- -Mali. Office du Niger --- Farming --- Mali (Republic). --- Office du Niger --- Irrigation - Economic aspects - Mali - History - 20th century --- Agriculture - Economic aspects - Mali - History - 20th century