A dog named Robot pokes his nose into a hole in the ground. What is down there? Four boys have come with the dog to find out.

Discovery in the Cave 2010, Random House (NY), New York, NY

ISBN-13: 9780375858932

Trade paperback

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Discovery in the Cave 2010, Random House Books for Young Readers, New York, NY

ISBN-13: 9780375958939

Hardcover

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