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| 001 | 1221213 | ||
| 003 | BD-DhUL | ||
| 005 | 20140822122523.0 | ||
| 008 | 840601s1957 nyua 000 0 eng | ||
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_aQA142 _b.S9 |
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_a511 _219 _bSWU |
| 100 | 1 |
_aSwain, Robert L. _q(Robert Lomond) |
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| 245 | 1 | 0 | _aUnderstanding arithmetic. |
| 260 |
_aNew York, _bRinehart _c[1957] |
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| 300 |
_axxi, 264 p. _billus., diagrs. _c24 cm. |
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| 650 | 0 | _aNumber concept. | |
| 650 | 0 |
_aArithmetic _xFoundations. |
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_aArithmetic _xStudy and teaching. |
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