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| 050 | _aQA241 N271s n°9 | ||
| 110 | _aNational Council Of Teachers Of Mathematics. | ||
| 245 |
_aEl Sistema De Los Enteros 9 _c Tr. Federico Velasco Coba. |
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| 260 |
_aMexico _b Trillas |
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| 300 | _a80 p. | ||
| 650 | _a1. NUMEROS ENTEROS. | ||
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