000 00320nam a2200133Ia 4500
005 20250612122300.0
008 250601s1986 xx 000 0 eng d
020 _a8170247233
100 _aDr.N .venkataiah
245 0 _aEducational technology
260 _aNew Delhi
_bWEIY VCH
_c1986
300 _a654
942 _2ddc
_cBK
999 _c2800
_d2800