"Écologie Sahel Histoire." . . "Wirtschaft." . . "1600-1850." . . "1600-1850" . "Grensgebieden." . . "Desertifikation." . . . . "Desert frontier : ecological and economic change along the Western Sahel, 1600-1850" . . . . . . . "History" . . . "History"@en . . . "Desert frontier" . . . . . . . . . . . "Desert frontier : ecological and economic change along the Western Sahel, 1680-1850" . . . . . . "Desert frontier ecological and economic change along the Western Sahel, 1600-1850"@en . "Desert frontier ecological and economic change along the Western Sahel, 1600-1850" . . . "Geschichte." . . "Wüste Umwelt Wirtschaftsgeschichte Sahel." . . "Umweltschaden." . . . . "Nuisances Sahel Histoire." . . "Environnement Dégradation Sahel Histoire." . . "Wirtschaftliche Lage." . . "Sahel" . . "Sahel." . "Pollution Sahel Histoire." . . "Handel." . . "Ecologische aspecten." . .