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631.459 --- 631.6.02 --- 631.6.02 Soil and water conservation. Erosion control --- Soil and water conservation. Erosion control --- 631.459 Erosion --- Erosion --- Conferences - Meetings
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Climatologie --- Climatology --- Ressource en eau --- Water resources --- Ressource en sol --- Soil resources --- Conservation des ressources --- Resource conservation --- Système d'exploitation agricole --- farming systems --- Système agropastoral --- Agropastoral systems --- Moyen de production agricole --- farm inputs --- Zone soudano-sahélienne --- Sudano Sahelian Region --- 631.6.02 --- 631.11 <662> --- Soil and water conservation. Erosion control --- Farms, farm properties and farming systems--Sahel --- Conferences - Meetings --- 631.11 <662> Farms, farm properties and farming systems--Sahel --- 631.6.02 Soil and water conservation. Erosion control --- Soil management --- Crops and water --- Crops and water. --- Soil management. --- Farming systems --- Crop production --- Water and water use
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