000 00335nam a2200145Ia 4500
008 220421s9999||||xx |||||||||||||| ||und||
020 _c350
040 _aET
100 _aMangal, S K & Mangal, Shubhra
245 0 _aLearning and Teaching
260 _bShipra Publications
_aDelhi
300 _a357
500 _a58629
942 _cBK
999 _c64592
_d64592