| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1971 | 978-0-903701-00-6 | D. Tecwyn Lloyd | Lady Gwladys a phobl eraill |
| 1972 | 978-0-903701-01-3 | Brinley Richards | Hamddena |
| '' | 978-0-903701-02-0 | D. Tecwyn Lloyd | Lady Gwladys a phobl eraill |
| 1974 | 978-0-903701-03-7 | Gwynfor Evans | Land of My Fathers: 2000 Years of Welsh History |
| 1977 | 978-0-903701-07-5 | Islwyn Lloyd | Emynau a cherddi |