00256nam a2200109Ia 4500082001700000100002300017245003300040260003600073300002700109500000500136700000500141  a514bF818.TP  aFrancis, George K.  aA topological picture bookb  aNew YorkbSpringer-Verlagc1987  axv, 194p. Index, Bibl.  a  a