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020 _a981-00-1716-2
082 _a372.7
_bPEN
100 _aPeng, T.S.
245 _aMathematics
260 _bSystem Publishing House
_c1990
_aSingapore
650 _aPrimary Education
942 _2ddc
_cLM
999 _c21101
_d21101