00313nam a2200121Ia 4500082001700000100002300017245003100040260004900071300002200120490003900142500000500181700000500186  a514bL495.IT  aLefschetz, Solomon  aIntroduction to topologyb  aNew JerseybPrinceton University Pressc1959  aviii, 218p. Index  aPrinceton Mathematical seriesv 11  a  a