When Jeff and his robot Norby accompany Admiral Yobo to prehistoric times so the admiral can do family research, the trip turns into a dangerous adventure.
- ISBN10 0802768938
- ISBN13 9780802768933
- Publish Date 1 September 1989
- Publish Status Out of Print
- Out of Print 14 June 2021
- Publish Country US
- Imprint Walker & Company
- Format Hardcover
- Pages 100
- Language English