Cofnodion Plaid Cymru, 1915-1999, yn cynnwys cofnodion, agenda and gohebiaeth y pwyllgor gwaith a phwyllgorau eraill, 1925-1997; gohebiaeth gyffredinol, 1925-1998, gyda nifer o aelodau a swyddogion blaenllaw y blaid; cofnodion, gohebiaeth a phapurau eraill y gwahanol bwyllgorau rhanbarthol, 1925-1997, a changhennau,1930-1992; cofnodion a dogfennaeth y Cyngor Cenedlaethol, 1967-1997; cofnodion ariannol, yn cynnwys rhai papur newydd misol y blaid Y Ddraig Goch a Welsh Nation a Chronfa Gŵyl Ddewi, 1927-1996; rhaglenni a threfniadau ar gyfer cynadleddau ac Ysgolion Haf, 1933-1998; cofnodion aelodaeth, 1930-1996; papurau y Grŵp Ymchwil, [c.1960]-1995; papurau, yn cynnwys areithiau ac effemera, yn ymwneud ag etholiadau, 1929-1999; papurau yn ymwneud ag Adran y Menywod, 1924-1996, a'r Mudiad Ieuenctid, 1964-1998; papurau yn ymwneud â refferendwm datganoli 1979,1969-1983, a refferendwm 1997, a Chynulliad Cymru,1992-1998; papurau yn ymwneud â Y Ddraig Goch, Welsh Nation a chyhoeddiadau eraill, 1932-1996; deunydd printiedig gan Blaid Cymru ac eraill yn cynnwys llyfrau, cyfnodolion a phamffledi,1913-1996; torion o'r wasg, 1924-1996; cylchlythyron, 1938-1992; papurau yn ymwneud â'r Blaid Seneddol,1980-1996; papurau unigolion ac rhai ar wahanol bynciau amrywiol, 1926-1998 = Records of Plaid Cymru, 1915-1999, including minutes, agendas and correspondence of the executive and other committees, 1925-1997; general correspondence, 1925-1998, with many prominent party members and officials; minutes, correspondence and other papers of the various regional committees, 1925-1997, and branches, 1930-1992; minutes and records of the National Council, 1967-1997; financial records, including those of the party's monthly newspaper Y Ddraig Goch and Welsh Nation and Cronfa Gwyl Dewi, 1927-1996; arrangements for and programmes of conferences and Summer Schools, 1933-1998; membership records, 1930-1996; papers of the Grŵp Ymchwil (research group), [c.1960]-1995; papers, including speeches and ephemera, relating to elections, 1929-1999; papers relating to the Adran Menywod (Women's Section), 1934-1996, and the Mudiad Ieuenctid (Youth Movement), 1964-1998; papers relating to the 1979 devolution referendum, 1969-1983, and the 1997 referendum and Welsh Assembly, 1992-1998; papers relating to Y Ddraig Goch, Welsh Nation and other publications, 1932-1996; printed matter by Plaid Cymru and others including books, periodicals and pamphlets, 1913-1996; press cuttings, 1924-1996; circulars, 1938-1992; papers relating to the Parliamentary Party, 1980-1996; papers of individuals and to various miscellaneous topics, 1926-1998.

Papurau gwleidyddol Dafydd Elis Thomas, yn cynnwys adroddiadau a datganiadau i'r wasg, 1975-1991; areithiau ac erthyglau, 1980-1990; gohebiaeth gyffredinol a gwahoddiadau, 1974-1992; gohebiaeth, nodiadau ar drafodaethau a phapurau eraill yn ymwneud â gwaith Tŷ'r Cyffredin, 1974-1992, a Llyfrgell Tŷ'r Arglwyddi, 1980-1991; gohebiaeth â'r Swyddfa Gymreig, 1974-1990; papurau'n ymwneud â Phlaid Cymru, 1974-1992; papurau'n ymwneud â materion lleol, yn bennaf rhai Meirionnydd Nant Conwy a Gwynedd, 1972-1991, a materion rhyngwladol, 1971-1991; a phapurau'n ymwneud ag addysg yng Nghymru, yn cynnwys y Cwricwlwm Cenedlaethol ac addysg bellach, 1974-1991, amaethyddiaeth ac Undeb Amaethwyr Cymru, gan gynnwys lles anifeiliaid ac effaith trychineb Chernobyl ar ffermio defaid yng Nghymru, 1975-1991, diwydiant yng nghefn gwlad, Bwrdd Datblygu Cymru Wledig, ac effaith ail-gartrefi,1976-1991, papurau'r Ymddiriedolaeth Genedlaethol a'r celfyddydau, 1974-1991, datganoli, 1977-1992, cyfathrebu a'r cyfryngau, 1976-1992, cyfraith a threfn, 1975-1989, problemau alcohol a phroblemau cymdeithasol, 1975-1991, yr iaith Gymraeg, 1973-1992; diwydiant, 1974-1989, yr economi, 1972-1990, iechyd a nawdd cymdeithasol, 1971-1990, trafnidiaeth, 1975-1989, ac ynni niwclear, 1971-1991 = Political papers of Dafydd Elis Thomas, including reports and press releases, 1975-1991; speeches and articles, 1980-1990; general correspondence and invitations, 1974-1992; correspondence, notes on debates and other papers relating to the business of the House of Commons, 1974-1992, and to the House of Commons Library, 1980-1991; correspondence with the Welsh Office, 1974-1990; papers relating to Plaid Cymru, 1974-1992; papers relating to local matters, mostly Meirionnydd Nant Conwy and Gwynedd, 1972-1991, and international matters, 1971-1991; and papers concerning education in Wales, including National Curriculum and further eduaction, 1974-1991, agriculture and the Farmers' Union of Wales, including animal welfare and the effect of the Chernobyl disaster on sheep farming in Wales, 1975-1991, rural industry, Development Board for Rural Wales, and the effect of second homes, 1976-1991, National Trust and the arts papers, 1974-1991, devolution, 1977-1992, communications and the media, 1976-1992, law and order, 1975-1989, alcohol and social problems, 1975-1991, the Welsh language, 1973-1992, industry, 1974-1989, the economy, 1972-1990, health and social security, 1971-1990, transport, 1975-1989, and nuclear power, 1971-1991.

Papurau, [c.1890au]-1995, a gasglwyd gan Dafydd Orwig, yn ymwneud yn bennaf â Phlaid Cymru, yn cynnwys deunydd yn ymwneud â chenedligrwydd, diwylliant, gwleidyddiaeth ac economeg Cymru, yn eu plith amrywiaeth o adroddiadau, datganiadau a chyhoeddiadau Plaid Cymru, 1958-1995, a hefyd peth ddeunydd yn ymwneud â'r Alban ac Iwerddon. = Papers,[c.1890s]-1995, collected by Dafydd Orwig, relating mainly to Plaid Cymru, and comprising material relating to nationality, culture, politics and economics in Wales, including a variety of Plaid Cymru reports, manifestos and publications, 1958-1995, and also some material relating to Scotland and Ireland.

Papers of Cliff Prothero, including correspondence and papers relating to the Labour Party and Wales, and to the devolution debate, 1947-1989; certificates of qualifications, 1917-1968; photograph album, 1926-1964; scrapbook of press cuttings, 1934-1989; miscellaneous publications relating to the Labour Party, 1941-1964; and typescripts, correspondence and papers relating to Cliff Prothero's autobiography, Recount, 1981-1982. There are no papers relating to his public activities.

Papers, 1976-1996, of political interest, including copies of speeches of various politicians, 1976-1996; miscellaneous papers, 1981-1994, including interview notes, drafts of newspaper articles, television news scripts, notes from Rhodri Morgan MP and Sir Bernard Braine MP; press releases, 1982-1995; miscellaneous papers, [c. 1980]-1992, concerning Welsh matters, including the Welsh language, Welsh language broadcasting, parliamentary constituency boundaries in Gwent, the Welsh Office, road tolls, the National Museum of Wales, the distribution of a political newspaper, Y Glorian, in Rhondda schools, devolution, Labour Party Young Socialists; printed parliamentary debates, 1977-1994; House of Commons reports, 1986-1992; and miscellaneous printed material, 1993-1995. Additional Papers of political interest, from the late 1980s to 2007, accumulated by the donor as Lobby Correspondent for the Community News Service, at the House of Commons. This additional group remains uncatalogued.

Miscellaneous papers, 1995-2007, of the Liberal Democrats in Wales, many relating to the party's Welsh conferences and other events; material produced by the 'Yes for Wales' campaign in the 1997 devolution referendum, including the minutes of meetings of its steering committee; papers deriving from the 2008 Welsh party leadership election contest between Kirsty Williams and Jenny Randerson; and papers relating to possible voting patterns for the forthcoming National Assembly elections. = Papurau amrywiol, 1995-2007, y Democratiaid Rhyddfrydol yng Nghymru, llawer ohonynt yn ymwneud â chynadleddau’r blaid yng Nghymru a digwyddiadau eraill; deunydd a gynhyrchwyd gan yr ymgyrch 'Ie dros Gymru' yn y refferendwm datganoli yn 1997, gan gynnwys cofnodion cyfarfodydd y pwyllgor llywio; papurau’n deillio o'r etholiad ar gyfer arweinyddiaeth y blaid yn 2008 rhwng Kirsty Williams a Jenny Randerson; a phapurau’n trafod patrymau pleidleisio posib ar gyfer etholiadau’r Cynulliad Cenedlaethol yn y dyfodol.

The collection comprises minutes and agenda of the Liberal Democrats Wales meetings, 1987-1998; constituency papers, [c. 1987]-1997; financial papers, 1991-1998; correspondence, [c. 1985]-1998; conference papers, 1986-1998; election material, 1984-1999; party membership, 1989-1998; press and media relations, [c. 1985]-1998; party policy, 1991-1998; published materials, 1987-1994; and miscellaneous papers, [c. 1985]-1996.

Records of the Briton Ferry Labour Party, 1939-1988; including financial records, 1939-1986; minute books, 1945-1988; an attendance book, 1970-1984; and copies of the Labour Leader, 1915 and 1917.

Over four thousand files of constituency correspondence, 1979-1985, from individual correspondents or organizations; and subject files relating to the House of Commons 1979-1985, housing, 1980-1985; transport (including the Central Wales Line), 1982-1984; Squatters, 1983; Rate Support Grant, 1983-1984; Warnock Report on education, 1985; and miscellaneous correspondence and papers, 1980-1985.

Constitution and rules of the Hydro Group and minutes of meetings, 1983-1986; correspondence, 1983-1986; copies of Tonnau/Waves, 1984-1986; study reports and questionnaires, 1983-1984.

Papers, correspondence and press cuttings relating to Ireland, 1926-1978; Plaid Cymru, 1929-1965; Welsh political, economic and social affairs, 1931-1962; Pantybeiliau Folk School, 1933-1938; world economics, socialism and communism, 1934-1951; and Brittany, 1946; and personal papers, including correspondence, 1924-1978, diaries, 1921-1979, and academic papers, 1922-1946.

The collection consists of election addresses, leaflets, circulars and other printed matter, 1837-1991, generally acquired before the establishment of the Welsh Political Archive; election addresses, leaflets etc., 1905-2019, collected by the WPA; and printed materials, 1887-2019, concerning the political parties in Wales, various pressure groups and organisations, subject files, and other miscellaneous papers.

Welsh Republican Movement and Plaid Cymru papers collected by Cliff Bere, 1940-1973, including correspondence, [c. 1947]-1965; membership forms and subscriptions, [c. 1948]-1957; constitution, meetings and reports, 1949-1952; newspaper cuttings, 1949-1991; political and personal correspondence, 1933-1997; papers relating to Plaid Cymru, [c. 1949]-1996, including the Parliament for Wales Campaign, Cymdeithas yr Iaith (Welsh Language Society) campaign for bilingual road signs, 1971; 'Cofiwn', the National Commemoration Association, 1976-1987; the Welsh Socialist Republican Movement (Mudiad Gweriniaethol Sosialaidd Cymru) 1975-1985; Cymdeithas Cyfamod y Cymry Rhydd (the Society of the Covenant of the Free Welsh) 1986-1994; Cardiff City Planning Department, 1965-1982; Harri Webb papers, 1949-1996; Eurig ap Gwilym [d. 1988], 1976-1988; papers relating to holiday homes arson campaign and Bere's arrest, 1980-1982; Yr Undeb Celtaidd /The Celtic League, 1988-1993; the Free Wales Army, 1993-1998; unpublished drafts of articles, 1934-1996; various journals and pamphlets, [c. 1946]-1976; newspapers cuttings, 1946-1997; undated translations of pamphlets published by the National Museum of Wales; papers, 1984-1998, relating to his publications, and other printed ephemera, 1935-1956.