Transcripts of documents relating mainly to Merioneth: Instructions from the Council in the Marches to suppress felonies; charges to juries; a letter, with answer, to a gentleman in Wales touching suits in the Court of Star Chamber, 1598; a letter of recommendation of John Vaughan of Cair gay, 1601; a petition of the freeholders of Estymaner and Talpont; instructions to the Council in the Marches, 1606; a letter of Enianus, bishop of Bangor, to Lord John de Grey, 1310; orders for securing the peace of the Commonwealth; orders at Quarter Sessions, 1673; sentences against Hugh Nanney for incontinence, 1588, 1594; observations on tenures in Englefleld, Flintshire, and concerning a court held by Mr Mackworth; an order in the suit of Robert Lloyd v. Griffith Nanney, 1603; the opinion of George Lee concerning a Portuguese ship wrecked on the Merioneth coast, 1746; a draft petition for an Act to enclose Traeth Mawr and Traeth Bychan; a contract to erect a shire hall at Dolgelley, 1606; the divisions of Merioneth with their proportional assessments, 1689; a canvass for Mr Vaughan and a copy of R. W. Vaughan's address to Merioneth electors, 1796; a rental of Robert Morgan's estate; and the petition of Sir Robert Heath to Charles I.
Instructions to Sir William Bowes, Robert Bowes, and Lord Eure (Scottish border, 1589-1599), Sir George Carey in Ireland with the Earl of Essex, 1598, Mr Carrow Raleigh concerning musters, and Sir Thomas Shirley, Lord Sheffield, Dr Dale, and Mr Bodley (Low Countries, 1586-1598); instructions concerning the expedition to Spain, 1596; papers relating to the proposed Spanish marriage, 1623; speeches and petitions in Parliament, 1623-1626; a list of grants to the Duke of Buckingham and proceedings relating to his impeachment, 1626; and a letter by Ra: Eure, John Harbert, and Daniell Dunn from Breme, 1602.
Printed proclamations of the assumption of the style of King of Great Brittaine by James I, 1604, and of the calling in of testons, 2 Edward VI.
On the back of the former is a fragment of a Welsh poem beginning - 'a fi'n eiste'n obrydd...'

Transcripts, mainly by Robert Vaughan, Hengwrt, of the extent of the lordship of Denbigh, 8 Edward III; an exemplification of letters patent granted to John Weston, prior of the Hospital of St John of Jerusalem, 7 Henry VII; an undated extent of Merioneth; accounts of the escheator of Merioneth, 1615; and the extent of Caernarvon, 26 Edward III. Ff. 131-134 are very fragmentary.

Miscellaneous papers mainly of Anglesey and Merioneth interests. They include pedigrees, tax receipts, and a copy of 'Thos. Love Peacock's letter to Miss Jane Gryffydh of Caenycoid Festiniog'.

Three short stories depicting Welsh life in the counties of Merioneth and Anglesey. They are entitled 'Myfanwy Owen and Others', 'Teulu Nantceiliog' and 'Chancellor Bevan Bod Ifan'.

A volume, 1906, containing lists of communicants in the Diocese of Bangor, relating specifically to Montgomeryshire and Merionethshire.

A volume, 1906, containing completed financial returns, issued by the Welsh Church Commission, and balance sheets of parishes in the Diocese of Bangor, relating specifically to the Archdeaconry of Merioneth.

Electoral lists of the commotes of: Ardudwy Uwch Artro, 1860-1861; Ardudwy Is Artro, 1861; Mawddwy, [1860s]; Tal-y-bont, 1861-1863; and Ystumanner, 1860; and jury lists for the parishes of Beddgelert; Dolgellau; Llanfihangel-y-Pennant; Llanfihangel-y-traethau; Llanfrothen; Llangelynnin; and Trawsfynydd, 1866.

A group of documents relating to gold mining in Merioneth. It includes notes on various gold mines in the county; correspondence addressed principally to O. Parry Hughes, 1918-36; typescript evidence prepared for the Merioneth Gold Mining Inquiry, 1930, and a report of the proceedings; memoranda relating to the formation and development of the Merioneth Mining Development Committee, 1930; copies of printed reports by Professor Henry Louis on the possibilities of gold mining in Merioneth, 1930; notes on diamond drilling and its possibilities in Merionethshire; together with a few printed items, two photographs, press cuttings and miscellanea.

Papers relating to families and estates in north Wales, including the West family, the Chirk Castle estate, the Hengwrt, Rug and Nannau estate, the Wynnstay estate, the Penbedw estate, the estate of Richard Willding of Llanrhaeadr Hall, Denbighshire, and the Whitehall-Davies family of Broughton Hall, Flintshire, and Llannerch, Denbighshire. Records and correspondence, including relating to abstracts of title, chapels, churches, conveyances, inclosures, industrial activity, law suits, mining, parliamentary elections, probate, railways, schools and tithe commutation. Office records, including cash journals, bill books and letter books, [19th century]-[20th century].

Gohebiaeth, barddoniaeth, rhyddiaith a phapurau teuluol, yn ymwneud â J. W. Jones, 1878-1954, a'i dad, 'Glan Barlwyd', 1866-1917; deunydd a gasglwyd gan J. W. Jones yn ymnweud ag unigolion a sefydliadau yn ardal Blaenau Ffestiniog, gan gynnwys gohebiaeth, barddoniaeth a phapurau eraill o eiddo 'Gwilym Deudraeth', 1917-1939, 'Elfyn', 1874-1917, Y Parch. R. R. Morris, 1883-1933, 'Alafon', 1875-1915, 'Llifon', 1899-1916, 'Isallt', 1887-1913, a 'Glyn Myfyr', 1893-1937; llythyrau at John Daniel Davies yn rhinwedd ei swydd fel golygydd Y Rhedegydd, 1930-1942; barddoniaeth a phapurau eraill o eiddo T. Gwynn Jones, 1910-1944; barddoniaeth, [1840]-1940, gan amryw feirdd, yn cynnwys Hedd Wyn ac R. Williams Parry; deunydd rhyddiaith amrywiol, peth ohono wedi'i gyhoeddi yn Y Drysorfa ac yn Y Rhedegydd, 1879-1954; llawysgrifau cerddorol, 1876-[c. 1934]; beirniadaethau eisteddfodol, 1870-1939; llyfrau lloffion yn cynnwys torion o'r wasg, [c. 1879]-1940; dyddiaduron, 1864-1935; cofnodion chwareli llechi Blaenau Ffestiniog, 1868-1951; amryw gyfrifon a llyfrau cyfrifon yn ymwneud â gwahanol fusnesau a sefydliadau, 1784-1932; cofnodion yn ymwneud ag eglwysi'r Methodistiaid Calfinaidd, 1840-1951, gan gynnwys rhai Bethel, Tanygrisiau, [1840x1945]; pregethau a nodiadau crefyddol,1846-1952; deunydd printiedig yn cynnwys effemera etholiadol, marwnadau, baledi, carolau ac emynau, 1820-1948; a gweithredoedd a dogfennau yn ymwneud â siroedd Caernarfon, Meirionnydd a Dinbych, 1759-1947. = Correspondence, poetry, prose and family papers, relating to J. W. Jones, 1878-1954, and to his father, 'Glan Barlwyd', 1866-1917; material collected by J. W. Jones relating to individuals and organizations in the Blaenau Ffestiniog area, including correspondence, poetry and other papers of 'Gwilym Deudraeth', 1917-1939, 'Elfyn', 1874-1917, Rev. R. R. Morris, 1883-1933, 'Alafon', 1875-1915, 'Llifon', 1899-1916, 'Isallt', 1887-1913, and 'Glyn Myfyr', 1893-1937; letters to John Daniel Davies as editor of Y Rhedegydd, 1930-1942; poetry and other papers of T. Gwynn Jones, 1910-1944; poetry, [1840]-1940, by various poets, including Hedd Wyn and R. Williams Parry; various prose material, some of which was published in Y Drysorfa and Y Rhedegydd, 1879-1954; musical manuscripts, 1876-[c. 1934]; eisteddfod adjudications, 1870-1939; scrapbooks containing press cuttings, [c. 1879]-1940; diaries, 1864-1935; records of Blaenau Ffestiniog slate quarries, 1868-1951; various accounts and account books relating to various trades and organisations, 1784-1932; records relating to Calvinistic Methodist churches, 1840-1951, including those of Bethel, Tanygrisiau, [1840x1945]; sermons and religious notes, 1846-1952; printed material including electoral ephemera, elegies, ballads, carols and hymns, 1820-1948; and deeds and documents relating to Caernarfonshire, Merionethshire and Denbighshire, 1759-1947.

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.

Papers, 1679-1983, of and accumulated by H. Noel Jerman, comprising: research papers, 1914-1975; files relating to his work in the Secret Intelligence services, 1941-1945; correspondence, notes and other papers relating mainly to archaeology, and also to his professional activities, 1948-1983; 'Notes and Memoranda' relating to events organised by the Cambrian Archaeological Association, 1883-1894; original records collected by him, 1679-1926, including deeds and documents relating to properties in Kerry, Montgomeryshire, 1679-1885, and Kerry School, 1843-1873, and copies of local newspapers, 1834-1868; records relating to the Dolforgan estate, including deeds and documents relating to properties in Montgomeryshire, Carmarthenshire and Merionethshire, 1807-1910, financial records, 1889-1939, and letter books, 1892-1930.

An additional consignment of materials of, and accumulated by, the late H. Noel Jerman (1909-1994), including his research papers relating to properties in Kerry and surrounding areas, papers relating to the Dolforgan estate, together with maps, sale catalogues, plans and photographs, and a lithograph of Dolforgan Hall by T. Way. This group remains uncatalogued.

Papers of Henry Robertson, comprising personal and estate papers, 1829-1907; records of a very large number of Welsh railway undertakings, 1786-1911, comprising books of reference, surveryors' notebooks, acts of parlimaent, bills and estimates, conveyances and other title deeds, specifications and tenders, prospectuses and miscellaneous papers; office papers, correspondence and miscellaneous professional papers, 1824-1903; papers relating to several clubs and societies, 1888-1907; and printed books and papers, 1786-[c.late 19th cent.].

Deeds, 1555-1918, of clients and relating to properties in Cardiganshire, Merionethshire, Montgomeryshire and Radnorshire, including papers of the Penglais estate in the Aberystwyth area, 1555-1918; Aberystwyth borough records, 1759-1813; letters, 1794-1882; papers of John Parry, solicitors, Aberystwyth, including share certificates of the Aberystwyth Gas and Coke Company, 1839; Bwlch Consolidated Lead Mines, 1847; records concerning the Aberystwyth and Tregaron Bank, 1813-1844; miscellaneous papers, [c. 1783]-1932; printed items, [c. 1783]-1867; certificates of shares in the Aberystwyth Public Rooms, 1818-1821, and the Robinson Gold Mining Company, 1903; letters and papers relating to the estate of Roderick Richards, Penglais, [c. 1830]; builders' accounts, 1845; and tithe receipts, 1927-1932.

Records and papers collected by Emrys Roberts, 1945-1983, including correspondence and papers relating to the National Eisteddfod, 1959-1976; the Development Board for Rural Wales, 1973-1981; and Wales (West and North) Television Ltd, 1960-1967. There are also papers relating to other committees on which Emrys Roberts sat, 1967-1983, and other miscellaneous papers, 1945-1981.

Papers of Elizabeth Baker, 1740-1798, comprising correspondence, 1743-1798; copies of verses, including some relating to the impeachment of Warren Hastings; correspondence relating to legal matters arising from the mining partnership and the ownership of the Nannau estate, 1779-1781; journals relating to silk worms, 1779-1782; and papers concerning politics, literature, and current events, 1740-1798.

Deeds and documents, 1598-1856, mostly assignments of mortgage and related bonds, concerning Dôl y Cae and other premises in the parish of Tal-y-llyn, including a lease from William Owen Pughe and his brother Richard to his son Aneurin Owen Pughe.

Development Board for Rural Wales records, containing minutes and other papers of the Board and various committees, 1977-1994; general administrative files concerning the establishment of the Board, its functions and responsibilities, and correspondence with other organizations, 1966-1990; construction files containing correspondence, contracts and estate plans relating to housing and industrial developments executed by the Board, particularly in Newtown, 1968-1993; records such as correspondence, minutes, notes and other papers relating to research studies on economic and social life in Mid-Wales carried out by the Board, 1968-1995; files relating to the Board's marketing and promotional strategy, 1978-1991; and press releases, 1977-1990; Mid-Wales Development Corporation records, 1962-1979, including annual reports, 1969-1977, minutes and papers of the Board and various committees, 1968-1979, and seal registers relating to MWDC projects, 1968-1976, containing compulsory purchase orders, contracts, leases and other documents.

An additional three files relating to the Development Board for Rural Wales, being DB/CF/101/1; DB/CF/101/2; DB/CF/101/3 – (Extension to Goodall & Swanwick factories at Dolgellau; factories at Dolgellau; and extension to Marian Park Industrial Estate, Dolgellau). These remain uncatalogued, and are closed for ten years from the date of the latest document in each file.