00334    a2200121   4500020001500000082001500015100001700030245005300047260005100100300001500151650002800166700001800194  a0749221720  a512.2bOPE  aAsche, David  aGroups & gemoetrybunit GE4b wallpaper patterns  aMilton KeynesbThe Open Universityc1994g1994  a64p.c31cm  aGroups and group theory  aHolroyd, Fred