| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Caerleon: Fortress of the Legion | 978-0-7200-0224-9 (0-7200-0224-9) | 1979 | Donald Moore |
| Welsh Ferns, Clubmosses, Quillworts and Horsetails: Descriptive Handbook | 978-0-7200-0210-2 (0-7200-0210-9) | 1978 | H.A. Hyde · A. E. Wade · Sydney Gerald Harrison |