After the cubs dig up treasure in their back yard, Mama and Papa take them to the museum where Professor Actual Factual sends them on a trip through time using his Anytime-Anyyear Machine.
- ISBN10 0062654624
- ISBN13 9780062654625
- Publish Date 20 February 2018
- Publish Status Active
- Publish Country US
- Publisher HarperCollins Publishers
- Imprint Collins
- Format Paperback (US Trade)
- Pages 24
- Language English