00454nam a2200145Ia 450000500170000000800460001703700120006304000210007504100130009608400190010924500360012826000900016430000090025449000450026320250508162446.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDL bengcFEDL  aeng2eng  a500, UNEqFEDL 0aNew horizons of human knowledge  aParis, FrancebUnited Nations Educational, Scientific and Cultural Organizationc1981  a98p.  aA series of public talks given at Unesco