00509nam a2200133Ia 4500008004100000040001700041082002000058110006200078245007800140260003500218300001300253440003100266650007800297190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta312bU58M  aUnited Nations. Department of Economic and Social Affairs 0aMethods of analysing census data on economic activities of the population  aNew YorkbUnited Nationsc1968  av, 143p.  aPopulation studies; no. 43  aDemographic surveys; Population; Labor supply; Fertility, Human; Morality