000 00321nam a2200121Ia 4500
008 190709s9999 xx 000 0 und d
082 _a371.335 W7
100 _aWeaver, Gilbert G
245 0 _aVisual aids : their construction and use
260 _aNew Jerseyy
_bD Van Nostrand Company
_c1961
300 _a388
942 _cBK
999 _c1534
_d1534