Ages 6-10. Did you know the center of the Earth was hollow? Do you
know the words that can take you there, if you're under the covers
in your swimming suit and prepared for the trip? Can you imagine
traveling anywhere in the world where there's a swimming pool --
and being home again in time for breakfast? If you haven't been to
Tube World yet, this book will tell you the secrets you need to
know. And it will tell you about some children who discovered Tube
World and used it to make the whole world a better place.
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