000 00263nam a2200097Ia 4500
008 190719s9999 xx 000 0 und d
100 _aB L Porwal/ V P Saxena
245 0 _aPrabandh ke siddhaant awam vyavahaar
260 _aNew Delhi
_bNational Pub
_c1989
942 _cBK
999 _c7711
_d7711