00358nam a2200121Ia 4500082002100000100008000021245004100101260003400142300000600176490004400182500000500226700000500231  a330.018bUn58.SS  aUnited Nations. Economic and Social Affairs International, Department of -.  aSample surveys of current interestb  aNew YorkbUnited Nationscv.d  a   aStatistical papers series C, no. 11, 14  a  a