000 00271nam a2200121Ia 4500
100 _aChakravarti, S. R.
942 _cBK
654 _a
245 _aAudio-visual aids in education
260 _aNew Delhi
_bSagar Publications
_c1977
082 _a371.33
300 _a8112
999 _c391937
_d391937
041 _aeng