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| 008 | 840601s1957 nyua 000 0 eng | ||
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_aSwain, Robert L. _q(Robert Lomond) |
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| 245 | 1 | 0 | _aUnderstanding arithmetic. |
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_aNew York, _bRinehart _c[1957] |
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_axxi, 264 p. _billus., diagrs. _c24 cm. |
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