00355nam a2200121Ia 4500082001700000100006300017245006400080260003500144300001400179490003000193500000500223700000500228 a312bUn58.CS aUnited Nations. Economic & Social Affairs, Department of-. aConcise summary of the World population situation in 1970b aNew YorkbUnited Nationsc1971 aiii, 35p. aPopulation studies, no.48 a a