000 00262nam a22001217a 4500
999 _c156299
_d156299
082 _a
_b
100 _aTara Chand
245 _aEducational technology/
_cby Tara Chand.
260 _aNew Delhi:
_bAnmol,
_c1990.
300 _a416p.
650 _a
942 _cBK