000 00274nam a22001097a 4500
082 _a520
100 _aWITTICH, WALTER ARNO,SCHULLER, C. F
_960241
245 _aAUDIO VISUAL MATERIALS THEIR NATURE AND USE
260 _aNEWYORK
_bHARPER
_c1953
300 _a564P
942 _cBK
999 _c570024
_d570024