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campaign and Bere's arrest, 1980-1982; Yr Undeb Celtaidd /The Celtic League, 1988-1993; the Free Wales Army, 1993-1998; unpublished drafts of articles, 1934-1996; various journals and pamphlets, [c. 1946]-1976; newspapers cuttings, 1946-1997; undated translations of pamphlets published by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.

Administrative records, publications and campaigning material of the socialist Welsh nationalist organisation Cymru Goch; containing minutes of committees, conference documents, correspondence, policy and discussion papers; newsletters and monograph publications.

Papers of Harri Webb, [c. 1919]-1995, including poetry, 1942-1989; reviews and reader's reports, 1974-1986; correspondence with publishers, broadcasters and editors relating to Webb's work, 1949-1995; correspondence from literary and artistic figures, [1940s]-1983; political correspondence, 1964-1974; political press cuttings, 1952-1981; papers relating to Plaid Cymru, 1961-1978, and Scottish politics, 1967-1969; and personal papers, [c. 1919]-1984.

A collection of Harri Webb's diaries. This group remains uncatalogued.

Llythyr, 5 Ebrill 1955, oddi wrth D. J. Williams, Abergwaun, at Huw Davies, [Llandaf], yn mynegi ei farn ynghlŷn â Mudiad Gweriniaethol Cymru, a sefydlwyd gan Davies ymysg eraill. = Letter, 5 April 1955, from D. J. Williams, Fishguard, to Huw Davies, [Llandaf], giving his views on the Welsh Republican Movement, of which Davies was a founder member.

Contains correspondence, articles, by Huw Davies, several copies of 'The Bulletin' and 'The Welsh Republican' published by the Welsh Republican Movement.

Papers relating to fringe Nationalist and left wing groups, 1963-1989, including material relating to Welsh Nationalist and Republican Groups, 1963-1989, material relating to Welsh left wing groups, 1969-1979, and papers relating to solidarity groups and campaigns, 1968-1989; published political material such as newspapers and periodicals, 1913-1989, records and papers of Cofiwn, 1970-1990, including material relating to the American Indian Movement Tour of Wales, 1986; papers relating to campaigns and activities of groups such as the the Owain Glyndwr Society, 1975-1990; papers relating to maritime history and heritage, 1973-1995; and miscellaneous papers, mainly relating to organisations in Aberystwyth, 1976-1989.

Papurau, 1936-1966, yn ymwneud â'r mudiad Gwerin, gan gynnwys llythyrau oddi wrth Goronwy Roberts, y llywydd, Walter Dowding ac Ernest Evans, a llythyrau diweddarach oddi wrth Goronwy Roberts; 'Gwerin. Braslun o'r polisi'; llyfr cofnodion y Pwyllgor Cyffredinol, 1936-1937; a thorion o'r wasg, 1936-1937. Harri Gwynn oedd Ysgrifennydd y mudiad hwn.