00409nam a2200121Ia 4500082002500000100006400025245006900089260003500158300003600193490004800229500000500277700000500282  a304.6309045bUn58.LT  aUnited Nations, Economic and Social Affairs, Department of-  aLevels and trends of fertility throughout the World, 1950-1970b  aNew YorkbUnited Nationsc1977  axiii, 361p. Tables, Corrigendum  aPopulation Studies, United Nationsv no. 59  a  a