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631.42 --- 631.51 --- 338.26 <663> --- Agricultural extension work --- -Arid regions agriculture --- -Desertification --- -631.51 Soil preparation and ploughing --- Soil preparation and ploughing --- 631.42 Soil analyses and experiments --- Soil analyses and experiments --- Aridization of land --- Desertization --- Dryland agriculture --- Dryland farming --- Extension work, Agricultural --- 338.26 <663> Economische planning. Nationale plannen. Ontwikkelingsplannen. Meerjarenplannen. Plattelandsontwikkeling. Rural development. Kosten-batenanlyse--Senegal --- Economische planning. Nationale plannen. Ontwikkelingsplannen. Meerjarenplannen. Plattelandsontwikkeling. Rural development. Kosten-batenanlyse--Senegal --- Control --- -Agricultural extension work --- Arid regions agriculture --- Desertification --- 631.51 Soil preparation and ploughing --- Climatology --- Deserts --- Agriculture --- Crop zones --- Desert reclamation --- Agricultural education --- Rural extension --- Rural development --- extension activities --- Villages --- Rural sociology --- Rural communities --- environment --- Sénégal --- Senegal --- Senegal. --- Desertification - Control - Senegal --- Arid regions agriculture - Senegal --- Agricultural extension work - Senegal --- Population paysanne --- Terroir --- Population