00253nam a22000977a 450000500170000000800410001702000150005804000080007324500250008126000490010620200901121803.0200901b           ||||| |||| 00| 0 eng d  a047192234x  cCML  aAlgebra.cCohn, P.M.  aGreat BritainbJohn Wiley and Sons Ltdc1989