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040 _cIITK
041 _aeng
082 _a515
_bOp2m
110 _aMilton Keynes.The Open University Press
245 _aFunctions and numbers
_cThe Open University Press
260 _aMilton Keynes
_bThe Open University Press
_c1978
300 _a60p
650 _aMathematics
710 _aMilton Keynes.The Open University Press
942 _cBK
999 _c556380
_d556380