000 00308nam a2200133Ia 4500
008 161121s9999 xx 000 0 und d
100 _aWEAVER. G. G. ; BOOLINGER. E. W
245 0 _aVisual aids - their conotrution & use
260 _cNIL
365 _b0
650 _aNIL
652 _a#N/A
942 _cBK
999 _c33638
_d33638