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Book, 2020
Current format, Book, 2020, First edition, All copies in use.
Book, 2020
Current format, Book, 2020, First edition, All copies in use. Offered in 0 more formats
Frog--and Science Hero--Professor Albert Hopper travels with his niece Polly and nephew Tad to the center of the Earth, encountering prehistoric cavefrogs, dinosaur fossils, and Yeti on the way.
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