Deeds, rentals, estate receiver's accounts, surveys, valuations, correspondence, maps and plans of the Ashburnham estate in Breconshire, Carmarthenshire and Glamorganshire, 1392-1968 (predominantly 1600-1925); sale catalogues and related papers, 1900-1923, deeds of the Mellington Hall estate in the parishes of Churchstoke and Mainstone in Montgomeryshire and Shropshire, 1753-1937, mortgaged by Samuel Rankin Heap to the trustees of the Ashburnham estate in 1923; manorial records and related papers of the manors of Cantref Selyf, 1650-1810, Talgarth, 1650-1826, Bronllys, 1661-1757, and Crickadarn, 1743-1809, all in Breconshire, and especially of the manor of Pembrey in Carmarthenshire, 1663-1922 (including papers relating to rights of shipwreck); accounts of collieries in Pembrey, 1714-1852 (mainly 1795 onwards), and papers relating to Pembrey tithes, colliery, port and harbour, and foreshore rights and wrecks, mainly 18-early 20 cent.

Records of the Welsh estates of the dukes of Beaufort, earlier the earls of Worcester and William Herbert, earl of Pembroke (d. 1469), including records for the Breconshire lordships of Crickhowell, from 1382, and Tretower, from 1532; ministers' accounts for Monmouthshire lordships from 1387 and manorial records for the lordship of Chepstow, from 1568, Monmouth, from 1416, Porthgaseg, from 1262, Raglan, from 1364, Treleck, from 1508, and for the lordship of Usk, from 1517; records for the Seignory of Gower and Kilvey from 1366 and for the borough and manor of Swansea, 1657-1835; deeds from the 13th cent.relating to the Badminton estate in Monmouthshire, Breconshire and in Gower, Glamorganshire; records from the 16 cent. relating to the coal and iron industries in Monmouthshire and Glamorgan; and estate management records including rentals, 1638-1933, accounts of rent arrears, 1669-1839, bailiffs, collectors and stewards' accounts, 1652-1858, and registers of leases, 1629-1918.