00307nam a2200121Ia 4500008004100000082001500041100002000056245003500076260003900111300001100150942000700161999001700168190709s9999    xx            000 0 und d  a512.8 B21P  aBall, Richard W 0aPrincipals of abstract algebra  aNew yorkbRinehart and winstc1963  aix,290  cBK  c40843d40843