00473nam a2200169Ia 4500008004100000082001700041100002500058245004500083250000600128260005400134300000800188650001400196650002000210653002100230653002700251700002500278170901s1964    xx            000 0 und d  a371.33bH11P  aHaas, Dr. Kenneth B. 0aPreparation and Use of Audio-Visual AIDS  a3  aNew DelhibPrentice-Hall of India Pvt. Ltd.c1964  a381  aEducation  aSocial sciences  aAudiovisual aids  aEducational technology  aPacker, Dr. Harry Q.