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020 _a9231019058
082 _a510.7
082 _bMor
245 _aStudies In Mathematics Education
260 _aParis
260 _bUnesco
260 _c1981
300 _ax;179
300 _bpb
300 _c9.5x6
350 _a0
365 _b0
365 _dRuppes
440 _v2
700 _aMorris, Robert (ED)
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