00290    a2200109   4500020001500000082001500015100002200030245006600052260003100118300002100149650001000170  a0340544406  a512.4bALL  aAllenby, R.B.J.T.  aRings, fields and groupsban introduction to abstract algebra  aLondonbArnoldc1991g1991  axxvi,383p.c23cm  aRings