Papers of W. Llewelyn Williams, KC, MP, 1861-2005, comprising diaries, letters, professional papers, printed material, personal papers, and papers accumulated by his family after his death. The collection also includes the research papers of Neville C. Masterman relating to the life and political career of W. Llewelyn Williams.

Papers of the Wales for the Assembly campaign, 1975-1979, including minutes, correspondence and papers of the Wales for the Assembly Action Committee and Research Sub-committee, 1976-1977; minutes of the Campaign's committee meetings, 1978-1979; pamphlets and leaflets, 1979; publicity and speeches, 1978-1979; correspondence, 1975-1979; press statements, 1979; and miscellaneous papers, 1978-1979.

The collection consists of papers relating to the Interim Federal Policy Committee, 1988-1989, the Association of Social and Liberal Democrat Councillors, 1988-1991, the Federal Executive of the SLD, 1990, copies of the Federal Green Papers, 1988, the Social and Liberal Democrats, 1986-1989, the Welsh Liberal Democrats, 1987-1991, the formation of the Social and Liberal Democrtas, 1988, the Brecon and Radnor Liberal Democrats, 1988-1990, local elections, 1988-1991, and application forms of prospective parliamentary candidates, c. 1988-1991.

Papurau'r cymdeithasegydd Alwyn D. Rees, 1911-1974, yn cynnwys papurau'n ymwneud â Phrifysgol Cymru, yn bennaf â Choleg Prifysgol Cymru, Aberystwyth, 1920au-1974, gan gynnwys papurau'n ymwneud â'r comisiwn a sefydlwyd i archwilio strwythur ffederal Prifysgol Cymru yn y 1960au; papurau ynglŷn â lle'r Gymraeg yn y Brifysgol a'r ymgyrch i sefydlu neuadd Gymraeg i fyfyrwyr yn Aberystwyth,1967-1974; papurau'n ymwneud â llyfrau, erthyglau a darlithoedd Alwyn D. Rees, 1933-1973, a Chymdeithas yr Iaith Gymraeg, [c.1964]-1974; papurau'n ymwneud â Barn, 1966-1967; papurau'n ymwneud â darlledu yng Nghymru, 1938-1974; papurau'n ymwneud â'r diwydiant llechi yng Nghymru,1946; papurau'n ymwneud â gwleidyddiaeth yng Nghymru, 1911-1974; gohebiaeth gyffredinol, 1935-1974; a phapurau a gohebiaeth bersonol , 1930-1974 = Papers of the sociologist Alwyn D. Rees, 1911-1974, including papers relating to the University of Wales, mainly the University College of Wales, Aberystwyth, 1930s-1974, including papers relating to the commission established to examine the federal structure of the University of Wales in the 1960s; papers concerning the place of the Welsh language in the University and the campaign to establish a Welsh student hostel at Aberystwyth, 1967-1974; papers relating to the University of Malta, 1940-1951; Alwyn D. Rees's research papers, 1933-1973; papers relating to Alwyn D. Rees's books, articles and lectures, and further related research papers assembled by him, 1925-1974; papers relating to the Welsh language, 1952-1974, and 'Cymdeithas yr Iaith Gymraeg', [c. 1964]-1974; papers relating to 'Barn', 1966-1975; papers relating to broadcasting in Wales, 1938-1974; papers relating to the Welsh slate industry, 1946; papers relating to politics in Wales, 1911-1974; general correspondence, 1935-1974; and personal papers and correspondence, 1930-1974.

Papurau, [1951]-[1956], 1984, yn ymwneud â'r ymgyrch i gael Senedd i Gymru. = Papers, [1951]-[1956], 1984, relating to the Parliament for Wales campaign.

Nodiadau darlithoedd, yn bennaf ar gyfer dosbarthiadau allanol ar hanes Cymru, 1943-1975; papurau ynglŷn ag ymchwil a chyhoeddiadau Frank Price Jones, 1947-1975, yn cynnwys drafftiau erthyglau ac adolygiadau, gwahanlithoedd a chopïau printiedig o'i waith cyhoeddedig; deunydd yn ymwneud ag erthyglau awduron eraill, 1932-1975; papurau, 1943-1975, yn deillio o waith Frank Price Jones ar gyfer y cyfryngau, y cynnwys sgriptiau radio a theledu, ac i bapurau newydd; papurau gwleidyddol, 1910-1975, yn cynnwys gohebiaeth, torion o'r wasg, pamffledi ymgeiswyr ac anerchiadau etholiadol, canlyniadau etholiadau, deunydd yn ymwneud ag Ymgyrch Senedd i Gymru yn y 1950au cynnar a Chomisiwn y Cyfansoddiad, 1969-1970; papurau, 1947-1975, ynghylch y gwaith cyhoeddus a gyflawnodd Frank Price Jones, yn cynnwys deunydd yn ymwneud â'r Eisteddfod Genedlaethol, 1922-1974; deunydd, 1966-1975, yn ymwneud â Phatagonia; papurau,1966-1975, yn deillio o waith Frank Price Jones ar gyfer Panel Cyfieithu'r Swyddfa Gymreig, Pwyllgor Amgueddfa Werin Cymru, 1956-1967, ac Urdd y Graddedigion Prifysgol Cymru, 1963-1975; gohebiaeth gyffredinol, 1941-1975, yn cynnwys grŵp mawr o lythyrau,1941-1975, oddi wrth Iorwerth C. Peate, cefnder Frank Price Jones; ac amrywiol. = Lecture notes mainly for extra-mural classes in Welsh history, 1943-1975; papers concerning Frank Price Jones's research and publications, 1947-1975, including drafts of articles and reviews, offprints and printed copies of his published work; material relating to articles by other authors, 1932-1975; papers, 1943-1975, deriving from Frank Price Jones's work for the media, including television and radio scripts, and for newspapers; political papers, 1910-1975, including correspondence, press cuttings, candidates' pamphlets and election addresses, election results, material relating to the Parliament for Wales Campaign of the early 1950s and to the Commission on the Constitution of 1969-1970; papers, 1947-1975, concerning the public work undertaken by Frank Price Jones, including in relation to the National Eisteddfod, 1922-1974; material, 1966-1975, relating to Patagonia; papers, 1966-1975, deriving from Frank Price Jones's work for the Welsh Office Translation Panel, the Committee of the Welsh Folk Museum, 1956-1967, and for the Guild of Graduates of the University of Wales, 1963-1975; general correspondence, 1941-1975, including a large group of letters, 1941-1975, from Iorwerth C. Peate, a cousin to Frank Price Jones; and various miscellanea.