00355nam a2200133Ia 4500080000500000011001900005245008400024260003700108300001100145500001500156650003200171010000900203010000900212  a  aUnited Nations  aSurvey of economic and social conéditionsin africa, 1989-1990/ United Nations  aNew York:bUnited Nations,c1992  a182 p.  aexemplares  aCondicoes economicas-africa  atrue  atrue