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32 pages first pub 2003 (editions)

nonfiction childrens mathematics science adventurous informative lighthearted medium-paced
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40 pages first pub 2003 (editions)

nonfiction childrens mathematics science adventurous informative lighthearted medium-paced

40 pages first pub 2003 (editions)

nonfiction childrens mathematics science adventurous informative lighthearted medium-paced