000 00368nam a2200145Ia 4500
008 150518s1993||||xx |||||||||||||| ||und||
020 _a8120715055
082 _a371.307
_bDAS
100 _aDas, R. C.
245 _aEducational technology
_cDas, R. C.
250 _a-
260 _aNew Delhi
_b Sterling Publishers Pvt Ltd
_c1993
300 _aix, 242 p.
942 _cBK
999 _c16771
_d16771