000 00268nam a2200121Ia 4500
008 190719s9999 xx 000 0 und d
100 _aS P Gupta
245 0 _aStatistical methods
250 _a3rd
260 _aDelhi
_bS Chand
_c1971
650 _aEconomics
942 _cBK
999 _c754
_d754