000 00264nam a2200121Ia 4500
100 _aS R Sharma
020 _a81-7445-077-7
942 _cBK
245 _aEducational technology
260 _aMohit Publ, New Delhi
_c1998
082 _a371.33 Sha
300 _av,202p
999 _c24994
_d24994