A child takes an imaginary 8,000-mile journey through the earth and discovers what's inside.
- ISBN10 0064432181
- ISBN13 9780064432184
- Publish Date 28 March 1990 (first published 1 September 1979)
- Publish Status Active
- Publish Country US
- Imprint HarperCollins Children's Books
- Edition Harper Trophy ed.
- Format Paperback (A-Format (178x111 mm))
- Pages 32
- Language English