000 00495nam a2200181Ia 4500
008 170901s1949 xx 000 0 und d
082 _a371.335
_bW25V
100 _aWeaver, Gilbert G.
245 0 _aVisual Aids
_bTheir Construction and Use
260 _aNew Jersey
_bD. Van Nostrand Company
_c1949
300 _a388
650 _aEducation
650 _aSocial sciences
653 _aAudiovisual aids
653 _aEducational technology
700 _aBollinger, Elroy W.
942 _2ddc
_cBK
999 _c4240
_d4240