000 00265nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aR K Yadav awam anya
245 0 _aSankhyikiye vidhiyan
260 _aNew Delhi
_bNational Pub
_c1989
650 _aMath
942 _cBK
999 _c7710
_d7710