000 00274nam a2200097Ia 4500
100 _aMahalanobis P C
245 _aNational Sample Survey No 12 A technical note on age grouping
260 _bGovt of Ind, Calcutta
082 _aB2817t4.2/N58.12/B08845
300 _app 34; 28*22
999 _c33567
_d33567