Papers of J. Glyn Picton, 1949-1991, mainly papers concerned with his researches into General Sir Thomas Picton (1758-1815) and the Picton family, 1951-1991, including correspondence, 1949-1977; notes, 1951-1975; copies and transcripts of probate record and Pembrokeshire plea rolls; photographs and news cuttings, 1975-1984; and copies of printed sources; with also records, articles and lectures reflecting J. Glyn Picton's public service in the fields of national health and industrial relations, 1951-1977.

Title deeds and other documents of depositor's clients, 1557-1939, relating to properties in Brecknockshire, 1557-1939, in particular to the Little Bell, Brecon, 1759-1883, and to the Pant Griffith estate, Merthyr Cynog, 1705-1856; in Glamorgan, 1731-1920, including the Court Rhyd-hir estate, 1731-1920; and in Radnorshire, 1639-1800, Monmouthshire, 1756-1834, and Herefordshire, 1557-1763.

Deeds, 1542-1797, relating to properties in Glamorgan, Brecknockshire and Carmarthenshire; memorandum book of ?Samuel Owsley and William Owsley of Brecon, with notes on rents, taxes and local events and history, 1679-1768; fragment of an antiphonal, [15th century]; a copy of The Reports of Sir Henry Hobart, Lord Chief Justice of Common Pleas, 1650; and a copy of The Larvae of the British Lepidoptera and their food plants, 1880.

Papers accumulated by Morgan Henry Williams including manuscript reminiscences [? of himself]; typescript scripts of radio programmes, 1938-1946, and contracts, 1951-1960, with the BBC relating to broadcast talks; and letters, 1894 and 1916.

Deeds and documents, 1553-1877, relating to properties in the parishes of Llandysilio, Llanfyrnach, Llanbedr Felffre, Lamphey and Mathri, co. Pembroke; Llanfihangel-ar-arth, Carmarthen town and borough, Llan-gain, Abergwili, Llanfihangel Rhos-y-corn, Newchurch, Llanfihangel Abercywyn, Llanybydder, Llanwinio, Tre-lech a'r Betws, Llanboidy, Aber-nant, Llangynnwr, Meidrim, St. Clears, Llandeilo Fawr, Llandybie and St. Ishmael, co. Carmarthen; Bangor [Teifi], Cellan and Caron, co. Cardigan. They include deeds for the Glandewely estate in Llanfihangel-ar-arth, 1553-1769, and the Golden Lion in Lammas Street, Carmarthen, 1771-1877.

Notebook, 1749-1777, of Samuel Deykin of Carmarthen, including a journal of his travels to London and Barnsley, March-June 1950; an imaginary journal for 1746, had Charles Edward Stuart acceded to the throne (ff. 11-16); topical verse, miscellaneous notes and memoranda, and religious meditations.

Personal papers of Sir John Williams comprising notes, essays, lectures and transcripts by him, [19th century]-[early 20th century]; certificates and testimonials, 1858-1915; cards and letters from the children of King George V and invitation cards to royal functions, 1889-1916; documents relating to his various honours, 1894-1911; photograph and stamp albums, 1849-[early 20th century]; other photographs, [1840s]-1905; press cuttings, [c. 1870]-1926; letters collected by Sir John, 1633-1912; letters to him, 1879-1922, the correspondents including members of the Royal Family; deeds and other documents relating to properties in Llangadog, to Plas Llanstephan and to Harley Street, London, 1790-1918; bibliographical material, [19th century]-[20th century]; medical notebooks and other papers, 1855-1900; diaries of Sir John and Lady Williams, 1872-1925; estate and financial records, 1890-[1926]; papers relating to public affairs, 1870-1911; miscellaneous items collected by Sir John, 1795-[c. 1919]; personal possessions, including University and commemorative medals, insignia, medical equipment, and ceremonial trumpets, 1861-1913; and deeds collected by Sir John Williams, 1546-1869, comprising deeds of the Vaughan family of Llanelli, Carmarthenshire, the Penry family of Swansea, Glamorgan, and the Dalton family of Pembrey, Carmarthenshire, 1545-1677, relating to properties in Llangennech and Pembrey, Carmarthenshire; deeds of John Jones, Ystrad, Carmarthenshire, relating to Llansadwrn, Carmarthenshire, 1632-1793, and the borough of Carmarthen, 1611-1869; Wynn of Gwydir deeds, 1352-1797, relating mostly to Caernarfonshire, Merionethshire and Denbighshire; miscellaneous Welsh deeds, relating mainly to properties in Carmarthenshire and Cardiganshire, 1451-[c. 1840]; and miscellaneous deeds relating to England (mainly Cornwall and Staffordshire), Ireland, and Scotland, 1586-1896.

A volume, 1906-1907, containing a printed summary of evidence of the Diocese of St Davids to the Welsh Church Commission, and typescript copies of nonconformist statistics for the counties of Anglesey, Caernarfonshire and Carmarthenshire.

Deeds, 1759-1862, relating to properties in the parishes of Llandingad, Llanfair-ar-y-bryn, Llangadog, Llansadwrn, and Myddfai, and the town of Llandovery, Carmarthenshire; and accounts, 1847-1849, of a Carmarthen draper.

Records relating to the Brigstocke family, including deeds of properties in Carmarthenshire and Pembrokeshire prior their acquisition by the Brigstockes, 1496-1889; deeds and documents of members of the Brigstocke family, 1655-1912; miscellaneous deeds, documents and papers relating to the Brigstocke family and lands in Carmarthenshire, including the Dolhaidd estate, 1846-1892, Cenarth, 1741-1838, and Llandyfaelog and Kidwelly, 1772-1833; legal papers, 1751-1775; and deeds and documents collected by W. Evans George relating to other estates, including: papers of the Lewes family of Gellidywyll, mostly bills and receipts, 1741-1792; draft deeds of W. Evans George for property in the Lower Teifi Valley, Cardiganshire and Carmarthenshire, 1896-1922; sale and account books of W. Evans George and Sons, 1863-1884; printed material, 1837-1925; papers concerned with local elections in Cardiganshire, 1741-1937; weekly account book of the surveyor of the South Wales Highway for Llanfihangel-ar-arth, 1866-1873; records of the Court of Petty Sessions, Penrhiw-pal, Cardiganshire, 1903-1927; and records of the Newcastle Emlyn Town Improvement Committee, 1903-1906.

Deeds, mainly relating to Cardiganshire and Carmarthenshire, 1668-1757.

Two volumes entitled 'Hen Gofion. Yr Ysgrepan neu Wyau Nythau Nathan', being a collection of autobiographical and other material compiled by Nathan Dyfed. The volumes include, in addition to the autobiographical material, notes and reminiscences relating to Glamorgan, its people and customs, a vocabulary of the Dyfed dialect, notes on 'eisteddfodau' mainly in Glamorgan, 1831-1888, an account of friendly societies in the Merthyr Tydfil district, poetry by Nathan Dyfed and others, a copy of Gwallteriana: sef y traethawd buddugol gan ... Walter Davies ... ar ansoddau gwahanol ddosbarthau barddonol Caerfyrddin a Morganwg ... Cyfieithiedig gan Jonathan Reynolds ... (Treherbert, 1879), etc.

Professional papers of Ywain Goronwy ap Griffith comprising agreements, specifications, plans and correspondence, 1927-53, mainly relating to the alteration, repair and erection of new buildings, both private and public, in Merionethshire, Montgomeryshire and Caernarfonshire; files relating to work done in the diocese of Bangor, mainly in the form of alterations and repairs to vicarages, 1932-1952; and papers, 1920-40, relating to the redemption of tithe rent-charges in various parishes of Anglesey, Caernarfonshire, Cardiganshire and Merionethshire.

Ymhlith y torion ceir 'The Labour Candidature: an appeal to the Electorate of Pembrokeshire', 1922, a gyhoeddwyd yn nhri o bapurau lleol y sir, ynghyd â fersiwn llawysgrif; 'A Welsh state. The new Nationalism', South Wales News, 1924; 'Carmarthen Borough Education Committee and the Welsh language', llythyr at olygydd The Welshman, 1924; 'Nodion y Cymro a'r Blaid Genedlaethol', The Labour News, 1925; 'The new Welsh Nationalism', Manchester Guardian, 1926; a 'Sir Gaerfyrddin-ar ddiwrnod garw', Heddiw, Hydref-Tachwedd 1941.