00323nam a2200121Ia 4500082001800000100002000018245005600038260003600094300002200130490003900152500000500191700000500196  a514bSt857.CT  aStillwell, John  aClassical topology and combinatorial group theoryb  aNew YorkbSpringer-Verlagc1980  axii, 301p. Illus.  aGraduate texts in Mathematicsv 72  a  a