000 00256nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aVenkataiah, N.
245 0 _aEdcuational Technology
260 _aNew Delhi
_bAPH
_c2008
300 _a234p.
942 _cBK
999 _c13729
_d13729