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21
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22
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23
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24
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25
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26
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27“...National council of teachers of mathematics...”
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28“...The National Council of Teachers of Mathematics...”
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29
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30
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31“...National council of teacher of mathematics...”
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32“...National Council of Teachers of English...”
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33
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34by National Council for Educational Technology“...National Council for Educational Technology...”
Published 1973
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35Published 1970“...National council of teachers of mathematics...”
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36Published 1970“...National Council of Teachers Mathematics...”
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37Published 1989“...The National Council of Teachers of Mathematics...”
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38
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39by NATIONAL COUNCIL OF TEACHERS OF MATHEMATICS“...National Council of Teachers of Mathematics...”
Published 1963
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40