Deeds, 1490-1977, including deeds and documents mainly relating to properties on Anglesey, Caernarfonshire, Merionethshire and Middlesex, 1675-1977; and deeds relating to properties in Finchley, Middlesex, 1490-1796.

Deeds and documents, 1719-1855, relating mainly to the Peniarth estate in Merionethshire and Caernarfonshire, mainly leases, bonds and mortgages, 1728-1767.

A notebook kept by William Williams, a Merionethshire farmer and/or butcher, in the mid nineteenth century, containing diagrams of sheep ear-marks used on farms in Merionethshire, mainly in the parishes of Trawsfynydd, Llanfachreth, Llanuwchllyn, Llanycil, Llanfor, Ffestiniog and Llandecwyn, accounts relating to the sale of joints of meat in the Ffestiniog and Trawsfynydd districts, and miscellaneous accounts and memoranda.

Account book, 1849-1852, 1864-1875, of the Rev. Joseph Morris, a Congregational minister in Nefyn and elsewhere in Lleyn, Caernarvonshire, also employed by the Madryn estate as a joiner.
The volume records general accounts, January 1849-January 1850 (ff. 2 verso-10); payments received at Nefyn, February 1851-June 1852 (ff. 10 verso-11 verso, 14); and payments for preaching and other work, January 1851-August 1852, January 1864-January 1875 (ff. 12-13 verso, 14 verso-38, 39, 40 verso).

Minute books, correspondence and papers, 1953-1992, relating to the Conservative Party in North Wales, including general political papers and circulars, 1971-1989; papers of the North Wales European Election, 1989; news sheets produced by the Brecon and Radnor Conservative Association, 1963-1972; papers relating to the training of constituency agents, 1970-1978; minutes and correspondence of the executive council of the Caernarvon Division of the Conservative and Unionist Association, 1953-1992; papers concerning the Pwllheli Conservative Club, the Association's Annual General Meetings, briefings and reports, 1982-1992; papers including minutes of the executive council and other committees; correspondence, circulars, memoranda, balance sheets of the Conway Constituency Conservative and Unionist Association, 1967-1982; minutes of the Llandudno Junction branch, 1951-1986; records of the Denbigh Constituency Conservative Association, 1974-1982; papers of the National Society of Conservative and Unionist Agents, both the National and Wales and Monmouthshire branches, 1970-1980; and minutes of the North Wales European Constituency Conservative Council, 1978-1989.

Copies of wills connected mainly with Montgomeryshire and Merionethshire, with notes by D. C. Lloyd-Owen.

Press letter books, 1878-1920, press invoice books, 1878-1919, account books, 1893-1920, and a minute book, 1900-1901.

Deeds and documents, mostly relating to cos Ang. and Mer. Several items relate to the Lloyd family of Dduallt, Ffestiniog, co. Mer., 1551-1740. The collection also includes overseer's accounts and other parochial records relating to the parish of Llandyfrydog, co. Ang., 1828-1869.

Deeds, documents and probate records, 1617-1853, relating mainly to the parishes of Caerhun, Conwy, Dwygyfylchi, Gyffin, Llanbedrycennin and Llannor, Caernarfonshire, and to the Abbey estate, in Denbighshire, Merionethshire and Caernarfonshire, 1811-1819; notes on sermons, 1861-1889; and miscellaneous papers relating to Amlwch, Anglesey, 1801-1868.

Papers relating to Cymdeithas Gwrandawyr Cymru, 1955-1976, Cymdeithas Telynau Cymru (The Welsh Harp Society), 1962-1979, papers relating to Rio Tinto Finance and Exploration Limited, 1969-1973 and the Chrome Company Ltd, 1970, miscellaneous papers, 1942-1970; papers relating to the Welsh Folk-Song Society, 1956-1985; and to his research and music interests, [1900]-[1995].

Letters, copies of replies and papers relating to the gardens at Brondanw, and the post of gardner/handyman in 1970, 1955-1977.

Deeds, 1597-1896, relating mainly to properties in Merionethshire with some relating to properties in Caernarfonshire and Montgomeryshire.

Deeds and documents relating to Cardiganshire, 1590-1751; and Montgomeryshire, 1517-1770; deeds and documents relating to the Hughes family of Gogarth, 1669-1910; and miscellaneous items, 1692-1825.

Papurau William Rowland (1910-1980,yn cynnwys nodiadau ar lenyddiaeth Gymraeg a chaneuon gwerin ar gyfer amrywiol sgyrsiau a darlithoedd,[1960au]; sgriptiau radio a nodiadau cysylltiedig, 1937-1950; llythyrau,1919-1980; papurau personol, yn cynnwys cytundebau hawlfraint,1910-1955; rhaglenni a thaflenni,1930-1980; a chyfnodolion a thorion papur newydd, 1932-1980 = Papers of William Rowland, 1910-1980, including notes on Welsh literature and folk songs and notes for various talks and lectures, [1960s]; radio scripts and accompanying notes, 1937-1950; letters, 1919-1980; personal papers, including copyright agreements, 1910-1955; programmes and leaflets, 1930-1980; and periodicals and newspaper cuttings, 1932-1980.