00489nam a2200169Ia 450000500170000000800460001702000180006303700120008104000200009304100130011308400240012610000230015024500360017326000890020930000100029865000110030820250508162018.0008  250505s9999    xx            000 0 eng d  a92-3-101048-4  aTextual  aFEDLbengcFEDL  aeng2eng  a341.1307, ABRqFEDL  aAbraham Herbert J. 0aWorld problems in the classroom  aParis, FrancebUnited Nations Educational Scientific and Cultural Organizationc1973  a223p.  aUNESCO