000 00289nam a2200133Ia 4500
008 220421s9999||||xx |||||||||||||| ||und||
040 _aBED
100 _aPuri , Usha
245 0 _aTeaching Technology
260 _bPragun Pub.
_aNew Delhi
300 _a397
500 _a3789
942 _cBK
999 _c3789
_d3789