00485nam a2200121Ia 4500008004100000040001700041082002200058110006200080245008400142260003500226300002000261650008200281190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta612.6bU58H  aUnited Nations. Department of Economic and Social Affairs 0aHuman fertility and national developmentba challenge to science and technology  aNew YorkbUnited Nationsc1971  ax, 140p:ill+tab  aFertility, Human; Birth control; Economic development; Population; Demography