Heidi Johnson
Consultant 6
| Title | Format | |
|---|---|---|
 | American Revolution | Paperback |
 | Sabertooths and the Ice Age | Paperback |
 | Tsunamis and Other Natural Disasters | Paperback |
 | Penguins and Antarctica | Paperback |
 | Sea Monsters | Paperback |
 | Ghosts | Paperback |
| Title | Format | |
|---|---|---|
| American Revolution | Paperback |
| Sabertooths and the Ice Age | Paperback |
| Tsunamis and Other Natural Disasters | Paperback |
| Penguins and Antarctica | Paperback |
| Sea Monsters | Paperback |
| Ghosts | Paperback |