00331nam a2200109Ia 4500008004100000040003800041100002200079245005000101260004200151300001200193653001600205211215s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aChandrashekhar, S 0aChinas population census and vital statistics  bHONG KONG UNIVERSITYaHONG KONGc1959  a69 P p.  aMATHEMATICS