Autograph letters, 1896-1910, to Daniel Lleufer Thomas from R. Morgans, St Clears, and Richard Williams, Celynog, Newtown, concerning Hugh Williams, Machynlleth and the Rebecca Riots, and from T. G. Crippen, London, concerning Marmaduke Matthews, Swansea.

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.

Letters, 1823-1895, many of them addressed to William Davies, Scoveston, M.P. for the county of Pembroke, or to solicitors associated with him, from residents in the United States of America, Canada, India, Australia, New Zealand, and the continent of Europe. Among the British correspondents are Henry Richard, Henry Fawcett, J. R. Kilsby Jones, and numerous Baptist ministers. A few letters refer to the 'Rebecca Riots' and to turnpike disputes in Pembrokeshire.

Estate and family records of the Powell family of Nanteos, previously of Llechwedd-ddyrys, Cardiganshire, mainly 17 cent.-20 cent, comprising mainly deeds, 17 cent.-20 cent., chiefly for properties in Cardiganshire, Breconshire and Montgomeryshire, but also containing deeds relating to Plastirion, Denbighshire, acquired by Maria Powell, wife of William Beauclerc Powell, 1787-1899, and deeds relating to the Herne family of All Hallows, Barking, following the executorship by Mrs Mary Powell of the will of Joseph Herne, 1684-1728; estate and family correspondence, 1664-1946, including correspondence about the Rebecca riots in Cardiganshire and proposals to establish a police force, 1840-1845, the Royal Cardiganshire Militia, public building projects, fishing rights, etc., 1806-1879; household and estate accounts, 1755-1922; inventories and sales of furniture, 1865-1919; game books, 1854-1886; and rentals 1756-1934; letters, deeds, accounts, etc., 1693-1938, relating to industrial ventures, mainly lead mining in north Cardiganshire; manorial records of Llanbadarn Fawr (otherwise Vaynor), 1745-1941, and Caron and Pennardd, 1817-1910, and Berthddu, 1821-1910; legal papers, 1690-1932; and probate records, 1565-1930.