| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1969 | 978-0-902158-00-9 | D. Ken Kyme | Cymru'r ffilatellwyr: Stampiau a dileadau post Cymru |
| 1972 | 978-0-902158-01-6 | Islwyn Ap Nicholas | Welsh Heretic: Dr.William Price, Llantrisant |
| 1973 | 978-0-902158-02-3 | D.Parry- Jones | Welsh Country Characters |
| 1975 | 978-0-902158-08-5 | D.Ben Rees | Chapels in the Valley: Study in the Sociology of Welsh Nonconformity |
| 1976 | 978-0-902158-15-3 | Clive Betts | Culture in Crisis: Future of the Welsh Language |