000 00251nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aN K Nag/ S K Nag
245 0 _aMathematics
260 _aLudhiana
_bKalyani Pub
_c1998
650 _aMath
942 _cBK
999 _c9887
_d9887