Letters and transcripts of Rowlands family letters, by A.R.B. Thomas, c. 1982, (original letters dated 1851-1903).
- Transcripts of letters of William Rowlands, junior (54), Thomas Rowlands (4) and other Rowlands family members (7) and checklists of letters compiled by A.R.B. Thomas
- Transcript of A life of Gwilym Lleyn by A.R.B. Thomas
- Letters (3) from A.R.B. Thomas to Derwyn Jones, former Librarian, Welsh Library, University of Wales, Bangor, relating to Gwilym Lleyn