Records mainly of the Glamorgan estate of the marquesses of Bute and of their predecessors, the earls of Pembroke. These include letters, 1588-1855, including letters of the Herbert family of Cogan Pill, 1588-1719, but primarily the personal and estate correspondence of John, second marquis of Bute, 1804-1855, (including letters relating to Bedfordshire, Cambridgeshire (Kirtling: Lady Bute's property) and County Durham estates); deeds, [1319]-1937; surveys, 1570-1842; rentals of the Glamorgan estate, 1728-1893, and the Cardiff estate, 1842-1895, estate and manorial accounts, 1573-1873; manorial records and deeds of over seventy manors, mainly in Glamorgan, [?1373]-1847; family settlements, [early 17 cent.]-1902; family probate records, 1612-1900; and legal and case papers, 1642-1921; correspondence of Alice, Lady Windsor, 1757-1776; a substantial number of copies of Acts of Parliament, relating mainly to roads, canals, docks and harbours, railways, public works and utilities, 1771-1928; and miscellaneous records. -- The archive illustrates the history of Glamorgan; the corporate life of the boroughs of Cardiff, Cowbridge and Llantrisant; the urbanization of the South Wales valleys, especially Merthyr Tydfil and Aberdare; the Glamorgan Commission of the Peace; the county militia and yeomanry, 1815-1837; the development of the coal and other industries (it includes papers relating to minerals and ironworks 16th-early 20th cent., accounts of coal shipped from Neath, etc. 1626-1682, quarry and lime kiln accounts 19th cent. Cardiff railway, dock and harbour papers and plans, 19th-20th cent.); labour and political unrest, including Chartism, Scotch Cattle, Rebecca riots; early trade unions; and the history of Cardiff castle, 16th-19th cent., including inventories 1581, 1585, estimate of repairs 1590 and plans of grounds.

The group comprises papers relating to trade unions, 1892-1998, unemployment and economic policy, 1916-1987, the mining industry and miners' strikes, 1924-1993, and the steel and tinplate industry, 1943-1983.

Letters, newspaper cuttings, notes, pamphlets and periodicals, typescripts, reports, volumes of parliamentary debates, and other papers of James Griffiths relating to the following: the coal industry and the South Wales Miners' Federation, 1912-1967; the Labour Party, 1919-1975; the Central Labour College, 1919-1922; National Insurance, 1931-1954; the Colonies, 1939-1972; his work as Secretary of State for Wales, 1964-1966; papers relating to Welsh affairs including devolution, the Welsh Reconstruction Advisory Council, education and local government reorganization, 1935-1975; constituency affairs, 1937-1969; overseas visits, 1936-1968; the Nigeria-Biafra War, 1968-1970; papers relating to his autobiography Pages from Memory, including letters from Gwilym Prys Davies and others, 1961-1969, notebooks, [1960s], typescripts, [1964]-1969, and cuttings of reviews, 1969; unpublished reminiscences, 1955-1974; notes and typescripts for lectures and speeches, 1940-1971; typescripts of broadcasts by Griffiths, 1937-1967; typescripts of articles and reviews, 1940-1974; newspaper cuttings, 1919-1974; and other miscellaneous personal matter, [1930s]-1975; and papers relating to Mrs Silyn Roberts, 1897-1954.

Photocopies of the agenda and minutes of meetings of the South Wales District of the National Union of General and Municipal Workers, 1937-1959.

The file comprises accumulated publications, including a copy of Lenin (V. I. Ulyanov), Ogiz State Publishing House of Political Literature, 1939, and Idris Cox, Y Maniffesto Comiwnyddol, 1948, with various pamphlets relating to the NUM and the South Wales Miners, trade unions, and Communism.

Papers of Goronwy R. Jones, 1941-1969, including correspondence, 1941-1969, files relating to trade union activities at several collieries, 1958-1967, notes and notebooks, typescripts relating to the South Wales coal industry, 1962-1967, and printed items, 1958-1963; papers of William J. Fortt, 1958-1968, including papers relating to the South Wales coal industry and the South Wales Area of the National Union of Mineworkers, notes, drafts of speeches and press cuttings.

The file comprises accumulated publications relating to Wales, 1937-1940, and 1959-1998, especially to South Wales, Trade Unions, Socialism, poverty, and including copies of Rebecca and Radical Wales.

Mae'r archif yn cynnwys fersiynau gwreiddiol llawysgrif o lawer o'i gynnyrch llenyddol, yn cynnwys barddoniaeth a thraethodau [c.1880]-1913, a dwy ddrama [c.1941]; torion o'r wasg a deunydd printiedig arall yn gysylltiedig â gweithgareddau Cymdeithas Unedig y Glowyr, Rhanbarthau Castell Nedd, Abertawe a Llanelli,1879-1894, a gohebiaeth, 1890-1939, yn enwedig â Syr Samuel Thomas Evans, AS = Contains original manuscripts of much of his literary output, including poetry and essays, [c. 1880]-1913, and two dramas, [c. 1941]; newspaper cuttings and other printed material relating to the activities of the Amalgamated Association of Miners, Neath, Swansea and Llanelli Districts, 1879-1894; and correspondence, 1890-1939, especially with Sir Samuel Thomas Evans, MP.