00417nam a22001337a 450000500170000000800410001702000150005805000190007310000250009224500660011726000410018330000210022465000380024520260312141908.0260312b        |||||||| |||| 00| 0 eng d  a0335057942  aQA36.5.0611980  aThe open university   aIntroduction bGroups and subgroups cby the open university   aBritian bThe open university c1980  a59p, :ills,bPbk  aIntroduction to pure mathematics