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Book, 2009
Current format, Book, 2009, 1st U.S. ed, All copies in use.
Book, 2009
Current format, Book, 2009, 1st U.S. ed, All copies in use. Offered in 0 more formats
Eleven-year-old Julian Calendar thought changing schools would mean leaving his "nerdy" persona behind, but instead he forms an alliance with fellow inventors Greta and Ben and works with them to prevent an adult from using one of their gadgets for nefarious purposes.
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