000 00263nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aB.S Gupta
245 0 _aCalculation without Tears
260 _aN. Delhi
_bOcean Books
_c2004
650 _aEnglish
942 _cBK
999 _c11703
_d11703