A letter, 16 January [?1964], in Welsh, from John Wyn Owen to Goronwy Prys Owen, relating to the filming of last services at Capel Celyn, Merionethshire, in September 1963, prior to the flooding of the Tryweryn reservoir.

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.

Miscellaneous essays, notes, etc., of a topographical and biographical nature, relating mainly to the parishes of Llanfor, Llanuwchllyn, and Llanycil, co. Merioneth, including an essay (62 pp.) on 'Hynafiaethau a Hynafiaid Ardal Celyn' [Cwm Celyn, parishes of Llanfor and Llanycil], by ' O letty'r chwilotwr', 1927; two short essays (19 pp. and 11 pp. respectively) on 'Hen Dyddynnod a Bythynod Dadfeiliedig Cwmtirmynach [ parish of Llanfor], ynghyd a preswylwyr olaf', the one by 'Brysiog', and the other bearing no name or pseudonym; a short essay (17 pp.) on 'Edward Jones y Wenallt' [? parish of Llanfor], by R. Price, Llansilin; notes by John Hughes on 'Hen Dyddynod Ardal y Parc'; notes by R. Prys Jones on 'Edward Foulke, Coedyfoel, Bala', who emigrated to America, 1698; and a copy of a paper on 'Hen Dyddynod Adfeiliedig y Plwy [ Llanuwchllyn], ag adgofion am rai o'u preswylwyr', read by Edw[ard] Edwards, to the Young People's Society of Yr Hen Gapel [the Congregational church, Llanuwchllyn]. Some of the essays noted were submitted for competition at local literary meetings.