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_a372.7 _223 |
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_aNational Council of Teachers of Mathematics _4aut _4pbl _912409 |
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_aTopics in mathematics for elementary school teachers / _cNational Council of Teachers of Mathematics. |
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_aWashington: _bNational Council of Teachers of Mathematics, _c1968. |
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_a377 p. ; _c24 cm. |
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_a; _v29 |
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_aArithmetic _xFoundations _9573 |
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_aMathematics _911246 |
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