000 00312nam a2200109Ia 4500
008 211214s9999 xx 000 0 und d
040 _cJayakar Knowledge Resource Centre
100 _aWittich,
245 0 _aAudio-visual materials, their nature and use
260 _bHarper & Brothers
_aNew yark
_c1953
942 _c1
999 _c38537
_d38537