Research papers and correspondence of John Collwyn Rees, 1949-1979, including academic correspondence, 1956-1978, addressed to Rees; publications, lectures, talks, reviews and notes by Rees, 1953-1978, mainly on J. S. Mill; research papers on political theory, 1951-1979; papers on equality and justice, [c. 1950]-1975; notes on Marxism and Communism, 1951-1974; notes on atomic warfare and disarmament, 1956-1963; notes on philosophy, [c. 1950]-1980; and notes on freedom and liberty, 1960-1978; and miscellaneous papers, 1970-1981.

Manuscript and typescript notes of lectures, addresses and articles, [c. 1940]-1960, by David James Jones ('Gwenallt') relating to his upbringing and the background to his poetry, Christianity and society, Communism, the decline of religion, the poet and Christianity, hymnology and hymnists, and aspects of poetry and literary appreciation.

The fonds comprises the papers of Ronald and Stella Garrett-Jones, 1923-1989. These include printed material, periodicals and pamphlets, mostly relating to communism and peace, 1923-1989; miscellaneous letters, leaflets, pamphlets, catalogues, programmes, scripts and reports relating mainly to nature and the arts, 1950-1976; policy papers, resolutions, minutes, letters, reports and newsletters relating to the Executive Committee of the Communist Party of Great Britain and the Welsh Congress, 1960-1989; reports, letters, minutes, newsletters and leaflets relating to Women's Rights, 1970-1989; press releases, minutes and publications relating to the FUW (Farmers Union of Wales) and the TUC (Trades Union Congress), 1980-1989; together with newsletters, letters, leaflets, reports, submissions, posters, minutes, notebooks, newspaper cuttings and maps relating to various pressure groups, especially to CND (Campaign for Nuclear Disarmament), 1981-1989.

Dyddiadur T. Llew Jones ar gyfer 1991, sy'n cynnwys cofnodion yn ymwneud â'i ddiddordebau a'i fywyd bob dydd, yn ogystal ag englynion ganddo (ff. 20 verso, 29 verso, 36, 52). = Diary of T. Llew Jones for 1991, giving an account of his daily life and interests, and also including englynion by him (ff. 20 verso, 29 verso, 36, 52).
Cynhwysa'r gyfrol gyfeiriadau at Dic Jones (passim), Donald Evans (ff. 86, 96, 100 verso, 101), Llwyd o'r Bryn (f. 132 verso), ac addasiad teledu Carol Byrne Jones o Tân ar y Comin (ff. 47, 85 verso, 92 verso, 146); ceir hefyd gyfeiriadau at gwymp Comiwnyddiaeth (ff. 116-119 verso, 122-123 verso, 169, 173 verso, 178 verso), Rhyfel y Gwlff (ff. 5-56 passim) a throwynt yn Llangynog ger Caerfyrddin (f. 31 verso). = The volume includes references to Dic Jones (passim), Donald Evans (ff. 86, 96, 100 verso, 101), Llwyd o'r Bryn (f. 132 verso) and Carol Byrne Jones' television adaptation of Tân ar y Comin (ff. 47, 85 verso, 92 verso, 146); also included are references to the fall of Communism (ff. 116-119 verso, 122-123 verso, 169, 173 verso, 178 verso), the Gulf War (ff. 5-56 passim) and a tornado which occurred in Llangynog, Carmarthenshire (f. 31 verso).

Papurau, 1942-1943, a dderbyniodd fel aelod o'r blaid yng Ngogledd Cymru ac ym Mhrydain.