00310    a2200121   4500001000700000040003200007245007000039260000800109650001200117650001400129650002400143650002100167125953  cEscola Canadense de Niteroi10aNational Geographic: Africa's ragged edge, journey into the sahel  aUSA 4aDeserts 4aMagazines 4aTerritorial dispute 4aAfrica (english)