00343    a2200121   4500020001500000082001500015100001700030245006200047260005100109300001500160650002800175700001800203  a0749221712  a512.2bOPE  aAsche, David  aGroups & gemoetrybunit GR3 b two - dimensional lattices  aMilton KeynesbThe Open Universityc1994g1994  a63p.c31cm  aGroups and group theory  aHolroyd, Fred