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Nature protection --- Geology. Earth sciences --- General ecology and biosociology --- Desertification --- Soil degradation --- Maps --- Africa --- -Soil degradation --- -551.435.77 --- 504.732.052 --- Degradation, Soil --- Land degradation --- Aridization of land --- Desertization --- Climatology --- Deserts --- -Maps --- Types of desert --- Overexploitation of terrestrial vegetation. Desertification. Desert formation --- 504.732.052 Overexploitation of terrestrial vegetation. Desertification. Desert formation --- 551.435.77 Types of desert --- Cartes --- Desertification - Maps. --- Soil degradation - Maps. --- Désertification --- Régions arides --- Sols --- Cartes. --- Dégradation --- Désertification --- Maps.