00314nam a2200121Ia 4500082001700000100001900017245004500036260003300081300002100114490004700135500000500182700000500187  a514bH514.CI  aHenle, Michael  aCombinatorial introduction to topologyb  aSan FranciscobFreemanc1979  axiv, 310p. Index  aA series of books in Mathematical Sciences  a  a