Estate and family records of the Vaughan family of Crosswood (Trawscoed), Cardiganshire, later the earls of Lisburne, including deeds, 1527-1940, for lands mainly in northern Cardiganshire, but including also in Devon, Middlesex, Durham, and Northumberland; rentals, 1661-1947, (which run with many gaps), including rentals for Cwmnewidion estate; manorial records, [c. 1560]-1900, including Anhuniog, Blaenaeron, Cwmystwyth, Cwrt, Hafodwen, Mefenydd, Morfa-mawr, Pennardd, and Ysbyty Ystrad Meurig, all in Cardiganshire; lead mining records in north Cardiganshire, [1771], 1839-1930; and Crosswood Hospital papers, 1939-1945.

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.