"First Scholastic printing, September 1998"--T.p. verso. "This edition is only available for distribution through the school market"--Cover verso.
Summary:
Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.
Series:
The magic tree house series ; #9. Osborne, Mary Pope. Magic tree house series ; #9.
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