| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1993 | 978-0-9520571-0-9 | Anne Digby | Secret Letters at Trebizon |
| '' | 978-0-9520571-1-6 | Alan Davidson · A.D. Langholm | Queen Rider |
| '' | 978-0-9520571-2-3 | Alan Davidson · A.D. Langholm | Queen Rider |
| '' | 978-0-9520571-3-0 | Colin Tulloch · John Richardson | Help! I'm a Dinosaur |
| 1994 | 978-0-9520571-7-8 | Anne Digby | The Unforgettable Fifth at Trebizon (The Trebizon books) |