Estate and family papers of Owen and Wynne families of Peniarth, Merionethshire, [15 cent.]-[19 cent.], including groups relating to Mostyn of Nant and Mostyn and Williams of Penbedw, Flintshire, to Maurice of Lloran, Denbighshire, and to Corbet of Ynysmaengwyn, Merionethshire, including estate papers, 1630-1870, rentals and accounts; deeds, 1361/2-1963, mainly for Peniarth, Aberllefenni, Penbedw, Drenewydd and Mallwyd estates; legal papers, 1539-1848; industrial papers, 1615-1852; county administration, 1468-1874; and non-family trust papers, 1468-1878, mainly relating to the Ynysymaengwyn estate.

Records of the Voelas and Cefnamwlch estates in Denbighshire and Caernarfonshire, mainly 19 cent.-20 cent.; including rentals, 1808-1949, uncommonly full estate correspondence, 1866-1948, building accounts, 1865-1870, estate ledgers, 1866-1912, title deeds, 1726-1956, valuations, 1855-1945; records of the Pooley estate, Warwickshire, and the Pooley Hall colliery, 1838-1909; and family and personal papers of the Wynne and Wynne-Finch families, including letters from Alice Mary Sybil Wynne Finch, 1914-1917, William Heneage Wynne Finch, 1919-1929, and John Charles Wynne Finch, 1924-1945.