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024 _a163
037 _cTextual
040 _aCSL
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_cCSL
041 _aeng
082 _aBv1.N7, L2
100 _aPenney David E
245 0 _aPerspectives in mathematics
260 _c1972
300 _ap.
_ccm.
650 _aMathematics
942 _hBv1.N7, L2
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999 _c99640
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