- A1/4.
- Ffeil
- 1965-1972.
Rhan oR. L. Gapper Papers
Papers, 1965-1972, relating to the memorial erected at Gwern Delwau on the shore of Llyn Celyn, Merionethshire, in commemoration of the village of Capel Celyn, which was flooded to make way for a reservoir in 1964.