- NLW MS 22057D.
- Ffeil
- [1960s]-1982
Rhan oGwenallt manuscripts
A complete typescript draft, [1960s], of Ffwrneisiau by Gwenallt, bearing manuscript corrections, [1969]-[1982], by J. E. Caerwyn Williams and Nel Gwenallt.
Williams, J. E. Caerwyn (John Ellis Caerwyn)