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    Schoolyard science 101 easy and inexpensive activities / 由 Lord, Thomas R.

    出版 2011
    主题: “...Science Study and teaching Activity programs....”
    An electronic book accessible through the World Wide Web; click to view
    电子 电子书

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  2. 2
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    Dig in! hands-on soil investigations.

    出版 2001
    主题: “...Soil science Study and teaching Activity programs....”
    An electronic book accessible through the World Wide Web; click to view
    电子 电子书

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