000 00297nam a2200121Ia 4500
008 090707b ii f a fnsan d
082 _a513.83
_bL60V
100 _aLietzmann, W.
_97766
245 _aVisual topology
260 _c1965
_aLondonj
_bChatto and Wendeas Pub
300 _a169p
942 _cBK
999 _c2452
_d2452