Records of the Brecon Beacons National Park Committee, 1984-1995, including committee agendas, minutes, correspondence and reports, 1986-1995, Development Control Panel and National Park Planning Committee agendas, minutes, planning applications, proposals and recommendations, 1986-1993, National Park Planning Sub-Committee agendas, minutes, planning applications and correspondence, 1988-1995, Park Management Committee agendas, minutes and reports, 1990-1993, Education & Information Working Party agendas, minutes and correspondence, 1992-1995, correspondence files, 1984-1995, tours, conferences and seminars, 1986-1995, and miscellaneous papers, 1986-1995.

Additional papers from Dr C. Stephen Briggs collected in connection with his appointment as a member by the Secretary of State for Wales on the Brecon Beacons National Park Committee, 1986-1995. This group remains uncatalogued.

An additional consignment of papers from Dr C. Stephen Briggs, comprising correspondence, minutes of meetings and various other papers, ca. 1989-1994. This group remains uncatalogued.

Further papers, 1986-2000, mostly comprising correspondence, including letters from Wyn Roberts and David Hunt regarding the donor's appointment to the Committee, together with a copy of the Section 3 Conservation Map (1990), and printed booklets and leaflets; July 2023. This group remains uncatalogued.

Papers and correspondence, 1974-2005, including material relating to the Historic Environment in the Brecon Beacons National Park (BBNP) Group and Ty’r Morwydd Advanced Field Study Centre, together with Letters of Appointments for the donor to serve on the BBNP Planning Committee 1985-96; April 2024. This group remains uncatalogued.

Minutes of the meetings of the Council, 1949-1959; memoranda, reports and notes deriving from the activities of the Council, 1949-1959, together with subject files covering regional devolution, trade at the south Wales ports, transport services in Wales, employment and the repopulation of the rural areas, a Welsh Television Service, functions exercised by the Welsh Office, and the Welsh economy.

Papers of D. Caradog Jones, [c.1940]-1978, comprising records relating to the Labour Party and Welsh rural areas, 1951-1959; general correspondence, 1951-1978; and papers and press cuttings, [1940x1959], concerning D. Caradog Jones and Montgomeryshire politics, 1940s-1950s.

Records accumulated by D. Peter Garbett Edwards, 1951-1993, including records relating to the Mid-Wales Industrial Development Association, 1957-1977; records relating to the Mid-Wales Development Corporation, 1973-1977; records relating to the Development Board for Rural Wales, 1978-1987; miscellanea, 1951-1996; and related printed material, 1966-1997.

Development Board for Rural Wales records, containing minutes and other papers of the Board and various committees, 1977-1994; general administrative files concerning the establishment of the Board, its functions and responsibilities, and correspondence with other organizations, 1966-1990; construction files containing correspondence, contracts and estate plans relating to housing and industrial developments executed by the Board, particularly in Newtown, 1968-1993; records such as correspondence, minutes, notes and other papers relating to research studies on economic and social life in Mid-Wales carried out by the Board, 1968-1995; files relating to the Board's marketing and promotional strategy, 1978-1991; and press releases, 1977-1990; Mid-Wales Development Corporation records, 1962-1979, including annual reports, 1969-1977, minutes and papers of the Board and various committees, 1968-1979, and seal registers relating to MWDC projects, 1968-1976, containing compulsory purchase orders, contracts, leases and other documents.

An additional three files relating to the Development Board for Rural Wales, being DB/CF/101/1; DB/CF/101/2; DB/CF/101/3 – (Extension to Goodall & Swanwick factories at Dolgellau; factories at Dolgellau; and extension to Marian Park Industrial Estate, Dolgellau). These remain uncatalogued, and are closed for ten years from the date of the latest document in each file.

Correspondence and papers relating mainly to Lord Hooson's political career, including papers regarding parliamentary questions, 1967-1978; the Welsh Liberal Party, 1963-1979; Montgomery County Liberal Association 1965-1979; Welsh Affairs, 1961-1978; University College of Wales, Aberystwyth, 1961-1968; Dyfed-Powys Constabulary, 1970-1976; foot and mouth disease in Wales, 1967-1968; transport problems in Mid-Wales, 1962-1974; National Theatre for Wales, 1968-1969; Rural Development Board for Wales, 1967-1970; Mid-Wales Hospital Service, 1972-1973; Farmers Union of Wales, 1966-1973; Aberfan Disaster, 1966-1967; television and radio reception in Wales, 1969-1976; Wales Tourist Board, 1968-1976; Plaid Cymru, Welsh nationalism, Welsh language, Devolution, Federalism, Welsh economy, unemployment, Rhondda West by-election, etc., 1960s-1970s; the Liberal Party correspondence, 1960s-1970s, Liberal Party organisation and policies, 1967-1971; Liberals and the Industrial Relations Bill, 1971-1973; Lib-Lab pact, 1977-1978; Liberal Foreign Affairs Panel, 1966-1967; NATO and the North Atlantic Assembly, 1966-1978; correspondence files of the Welsh Liberal Party, 1966-79; engagement diaries, 1966-1978; typescript speeches and notes for speeches, 1960s-1970s; parliamentary accounts, 1970-1972; miscellaneous speeches, press statements, newspaper cuttings, etc., 1960s-1970s; political papers [c. 1950]-1973, produced by various parties; Local Government Reform in Wales, 1993-1994; the Liberal Party's Pantyfedwen Conferences, 1956-1963; the London Welsh School, 1983-1993, the Llangollen International Eisteddfod, 1986-1997; the provision of speech therapy and physiotherapy in Clwyd, 1984-1990; constituency correspondence and papers, [1960]-1979; personal correspondence, 1965-1979; and correspondence, press releases and newspaper cuttings relating to Jeremy Thorpe, former leader of the Liberal Party, 1967-1979; together with papers relating to his business interests including, Laura Ashley Holdings Plc., 1984-1997; Severn River Crossing Plc, 1990-1997; and his legal career, 1949-1962. A further collection of Lord Hooson's papers were received in May 2011 - this group remains uncatalogued.

Papers of Sir Ben Bowen Thomas (1899-1977), educationalist and public servant, comprising autobiographical material on his career, interests and family, 1954-1972; biographical articles and an interview, 1964-1966; letters to his wife and daughter with references to his work with UNESCO and Welsh educational matters, 1947-1960; letters from Dr Thomas Jones and Sir Percy E. Watkins relating to educational issues and Coleg Harlech, 1926-1955; correspondence concerning BBT's work with UNESCO, 1954-1962; miscellaneous correspondence, 1948-1976; addresses and speech notes, 1949-1977; pamphlets, offprints and articles, 1941-1973; research notes on regions and towns of Wales during the 18th and 19th centuries; circulars, articles, reports, etc. relating to education and educational bodies in Wales, 1942-1975, to UNESCO, 1946-1958, and to public and cultural bodies such as the Welsh Language Council, ITA and the Rural Development Board, 1965-1973; McNair Report on the Training of Teachers, 1942-3; memorials, tributes and obituaries of other educationalists; and miscellaneous press cuttings and notes. The archive also includes a collection of sermon notes and exercise books of his grandfather, the Rev. Benjamin Thomas, (1838-1913), a Baptist minister in Ystrad Rhondda, Glamorgan.

Papers of the Local Public Inquiry on the draft Wales Rural Development Order, 1968, annotated by W. L. Mars-Jones.