000 00314nam a2200121Ia 4500
008 160710s1949 xx 000 0 und d
082 _a371.3 W 33 V
100 _aWEAVER,GILBERT G.
245 _aVISUAL AIDS THEIR CONSTRUCTION AND USE
260 _bD,VAN NOSTRAND COMPANY
_c1949
300 _a388
942 _2ddc
_cB
999 _c15745
_d15745