00620nam a2200157Ia 4500008004100000020001800041040001700059082002000076110007600096245013200172260003500304300001600339440003200355500002100387650005400408190328s9999||||xx |||||||||||||| ||und||  a92-1-151220-4  aNITILcNITIL  221sta312bU58G  aUnited Nations. Department of International Economic and Social Affairs 4aThe Sex and age distribution of populationbthe 1990 revision of the United Nations global population estimates and projections  aNew YorkbUnited Nationsc1991  aviii, 391p.  aPopulation studies; no. 122  aST/ESA/SER.A/122  aDemographic surveys; Population; Fertility, Human