- A1/7.
- Ffeil
- 1975.
Rhan oKyffin Williams Archive
Includes letters from Jack Raymond Jones (2), Gwilym O. Williams, Meic Stephens, Ralph Edwards (4), Franta Belsky, Priscilla Anderson (2), Clough Williams-Ellis, Joan Connell, Ieuan Rees, David Jenkins, Bernard Dunstan, and Diana Armfield.