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Gwilym Prys Davies and others, 1961-1969, notebooks, [1960s], typescripts, [1964]-1969, and cuttings of reviews, 1969; unpublished reminiscences, 1955-1974; notes and typescripts for lectures and speeches, 1940-1971; typescripts of broadcasts by Griffiths, 1937-1967; typescripts of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.

Deeds and papers relating to lands of the Hopkin family and others in the parish of Betws, Carmarthenshire, 1594-1748; papers relating to the Hopkin family, 1719-1898; and a poor rate account for the parish of Betws, 1818.

Papurau llenyddol Amanwy, yn cynnwys cerddi, caneuon a gweithiau mewn amryw ffurf, 1909-1953, yn enwedig pryddestau, 1909-1953, telynegion, 1910-1946, a sonedau, 1929-[1953]; rhyddiaith, 1924-1949, sy'n cynnwys darlithoedd, anerchiadau, storiâu byrion a nodiadau; sgriptiau radio,1942-1953; deunydd printiedig yn cynnwys emynau gan Amanwy a gweithiau ganddo ef ac eraill, 1919-1953; torion o'r wasg,1919-1945; a llythyrau,1950-1975. Gweler hefyd Trefniant = Literary papers of Amanwy, comprising poems, songs and other works of various forms, 1909-1953, notably pryddestau, 1909-1953, lyrics, 1910-1946, and sonnets, 1929-[1953]; prose works, 1924-1949, which include lectures, addresses, short stories and notes; radio scripts, 1942-1953; printed materials including hymns by Amanwy and works by him and others, 1919-1953; newspaper cuttings, 1919-1954; and letters, 1950-1975. See also Arrangement.