Once upon a Mastodon: All About Prehistoric Mammals by Bonnie Worth
| ISBN: | 9780375870750 |
| Publication date: | 23rd September 2014 |
| Author: | Bonnie Worth |
| Publisher: | Random House Books for Young Readers an imprint of Random House USA Inc |
| Format: | Hardback |
| Pagination: | 48 pages |
| Series: | The Cat in the Hat's Learning Library |