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.

A typescript of a pamphlet by Lady Stanley entitled 'Some Early British Churches on the North Coast of Caernarvonshire' (privately printed, 1897).

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.

Lists of sheriffs of Caernarvonshire, Merioneth and Anglesey; notes of some Caernarvonshire and Anglesey law cases submitted for opinion of several counsel, including John Parry, Caernarvon; a table of fees to be charged by the Clerk of the Peace for the County of Caernarvon as from 1779; copies of bills of costs in the ecclesiastical court of Bangor, 1777; bills of costs of erecting a seat in church by a faculty from the court at Bangor, 1779; etc.

Abstracts of some cases of Caernarvonshire interest heard in the Court of Star Chamber, temp. Elizabeth.

An incomplete biographical dictionary of Caernarvonshire worthies ('Enwogion sir Gaernarfon') (209 numbered pages, with numerous gaps) by 'Gwydion ap Don', which was submitted for competition at the National Eisteddfod held at Caernarvon in 1877.

'Notes on Places and Objects in Flintshire and Denbighshire' [and Caernarvonshire], including the parishes and churches of Bodelwyddan, Bodfari, Caerwys, Cilcain, Cwm, Dyserth, Flint, Gwaunysgor, Halkin, Hawarden, Broughton (St Mary's Church), Hawarden (St John the Baptist, Pentrobin), Holywell, Hope, Llanasa, Llanfynydd, Meliden, Mold, Nannerch, Nerquis, Newmarket, Northop, Rhuddlan, Rhyl, St Asaph (parish church and cathedral), Tremeirchion, Treuddyn, Whitford, Ysceifiog, Bangor-is-y-coed, Bettisfield, Hanmer, Is-y-coed, Marchwiel, Overton, Worthenbury, Abenbury Fawr, Allington, Abergele, Bersham, Bettws yn Rhos, Brymbo, Bryneglwys, Bylchau, Burton, Cefn (St Asaph), Cerrig-y-drudion, Chirk, Clocaenog, Denbigh, Derwen, Efenechtyd, Eglwysfach, Erbistock, Esclusham, Gresford, Gwytherin, Henllan, Holt, Llanarmon yn Iâl, Llanarmon Mynydd Mawr, Llanbedr Dyffryn Clwyd, Llanddoget, Llandegla, Llandrillo yn Rhos, Llandyrnog, Llanelian yn Rhos, Llanfair Dyffryn Clwyd, Llanelidan, Llanfair Talhaiarn, Llanferres, Llanfihangel Glyn Myfyr, Llanfwrog, Llangadwaladr, Llangedwyn, Llangernyw, Llangollen, Llangwm, Llangwyfan, Llangynhafal, Llannefydd, Llanrhaiadr yn Cinmerch, Llanrhaiadr ym Mochnant, Llanrhudd, Llanrwst and Capel Garmon, Llansannan, Llansantffraid Glyn Ceiriog, Llansantffraid Glan Conwy, Llansilin, Llantysilio yn Iâl, Llanychan, Llanynys, Marchwiel, Minera, Nantglyn, Pentrefoelas, Ruabon, Ruthin, St George's, Stansty, Trebrys, Trefnant, Wrexham, Ysbyty Ifan, Conway, Llangystennin, Llanrhos (Llandudno) and Llysfaen. Many illustrations of churches, houses, etc. have been included and there are additional notes by Susan Mainwaring (of Henblas, St Asaph).

Records of the Nefyn Branch of the Caernarvon Conservative and Unionist Association, including a minute book, 1960-1979, and minute book of the womens' branch, 1960-1976; circulars, [1960s]-1977; miscellaneous papers, [1960s]-1979; and publications from the Conservative and Unionist Central Office, 1946-1977.

Miscellaneous papers, 1856-1939, with annotations in the hand of Owain Llewelyn Owain, mostly relating to Caernarvonshire, including a letterbook, 1856, pertaining to Bryn Hafod y Wern slate quarry, Bethesda; a tribute, 1876, to Hugh Owens, Tal-y-sarn, musician, and father of Owain Llewelyn Owain; typescript copies, with manuscript emendations, of two speeches by David Lloyd George, the first delivered at Caernarfon in June 1930, and the second at Bangor, 17 January 1935; and a draft of a speech by Sir Thomas Artemus Jones, chariman of the North Wales Tribunal of Conscientious Objectors, delivered at Caernarfon Town Hall in November 1939.

Papers of W. A. Madocks, including his memoranda books, letters to John Williams (his agent at Portmadoc), 1806-1825, and some materials for his biography in the form of copies of letters from Ebenezer Thomas (`Eben Fardd'), John Thomas, Chwilog, Ellis Owen, Cefnymeusydd, and others; a 'statute book' of the 'Ancient and Renowned Borough of Tremadoc', 1805-1810, with an account of the Tremadoc Ball and Hunt; together with records from the Harbour Office, Porthmadog, including account books and registers of Portmadoc harbour, 1824-1917. Also included are records of the Festiniog and Blaenau Railway Co., 1866-1883; plans, sections and other records, 1860-1897, of the Aberystwyth and Welsh Coast Railway, the Bala and Festiniog Railway, the Beddgelert Railway, the Caernarvonshire Railway, the Caernarvonshire and Nantlle Railway, the Cambrian Railway, the Corris, Machynlleth, and River Dovey Tramroad, the Corwen and Bala Extension Railway, the Croesor Railway, the Croesor and Portmadoc Railway, the Festiniog Railway, the London and North Western Railway, the Merionethshire Railway, the Portmadoc, Beddgelert and Rhyd-ddu Railway, and the West Midland, Shrewsbury and Coast of Wales Railway; a register of shareholders and minute books of the Festiniog Refreshment House Company, 1878-1890; a minute book and share ledger of the Penrhyndeudraeth Lead Mining Company, 1875-1882; nominal and muster rolls of the Caernarvonshire Volunteers, 1860-1883, and other Caernarfonshire militia records; a minute book and papers relating to collections in Caernarfonshire towards Queen Victoria's Jubilee, 1886-1887; account books relating to slate quarries and to shipping, and miscellaneous Caernarfonshire material, 1723-[19th century].

Papers, 1634-1928, mostly deriving from and relating to the legal practice of Henry Rumsey Williams, comprising draft conveyances, abstracts of title, letters, accounts and miscellaneous papers of clients, including the estate of Wynn of Glynllifon, 1719-1840, the Griffiths family of Caernarfon and Amwlch, 1726-[1830s], Jared Jackson, 1760-1836, Plasgwyn estate, 1761-1846, Cefn Cwmwd estate, 1763-1828, Coed Helen estate, 1770-1838, Trergo estate, 1771-1832, Parry family, 1773-1788, Peniarth estate, 1773-1830, Orielton estate, 1774-1814, Bodior estate, 1778-1837, Faenol estate, 1778-1840, Arnold Robinson Burrowes, 1785-1837, Grindley family, [c. 1786]-1842, Morgan family, 1787-1839, Treiorwerth estate, 1787-1844, Evan Pritchard, 1788-1813, John Price, 1790-1844 Caerhun estate, 1791-1834, W. A. Madocks, 1799-1824, Nancall estate, 1802-1837, Morris Griffith, 1804-1832, Edward Griffith Roberts, 1805-1827, William Humphrey, 1805-1833, Plas Llanfair estate, 1805-1837, Baily Williams family, 1806-1838, Richard Garnons, 1809-1837, Cefn Hengwrt estate, 1810-1815, George Bettiss, 1810-1831, William Edwards, 1811-1836, Penrhyn estate, 1811-1837, Wyatt family, 1813-1835, Gelli Goch estate, 1815-1831, Anna Maria Wynne, 1816-1833, Robert Thomas, 1818-1839, Roberts family, 1818-1840, Bodegroes estate, 1819-1836, Hughes, Brydges and Granville, bankers, 1819-1840, Vickers family, 1820-1833, Boston estate, 1820-1839, Owen Griffith, 1822-1846, George Holmes Jackson, 1823-1841, the Rev. Hugh Hughes Wynne, 1831-1848, John Rowlands, 1832-1841, and Edward Hosier Williams, 1833, in Caernarfonshire, Anglesey, Denbighshire, and Merionethshire; legal correspondence, 1790-1848, probate records, 1727-1871, and papers relating to civil cases, 1757-1850, religion, 1788-1842, mining, 1779-1842, quarrying, 1798-1840, shipping, 1778- [c. 1841], roads and railways, 1834-1839; legal practice records, 1804-1841, and executorship papers, 1841-1855, belonging to Henry Rumsey Williams, and records of his family in Brecknockshire, Monmouthshire and Caernarfonshire, 1881-1928. Records relating to William's political activities have not survived.

Deeds, documents and plans, 1455-1895, relating to properties in Anglesey, Caernarfonshire, Denbighshire, Merionethshire and Montgomeryshire; including papers of the Poole family, owners of the Caenest and Pencraig estates in Merionethshire and Anglesey; surveys, [c. 1770] of the Caenest and Pencraig estates; and building leases for properties in the port of Amlwch, [late 18th century].

Manuscripts collected by, and papers of, the Rev. T. Llechid Jones, including personal correspondence, 1883-1943; miscellaneous correspondence, 1826-1907; diaries, 1888-1935; addresses, 1911-1937; miscellaneous notes, 1888-1941; antiquarian notes, 1700-1943, mainly relating to parishes in North Wales; press cuttings, 1890-1934; pedigrees, genealogical material and correspondence of H. R. Hughes, 1867-1920; deeds and documents relating to Llysfaen, Caernarfonshire, and elswhere, 1597-1880; and printed books, with manuscript notes, 1678-1937.

The manuscript of a review by Timothy Lewis (1877-1958), Aberystwyth in Zeitschrift für Ortsnamenforchung, 1930, of J. Lloyd-Jones: Enwau Lleoedd Sir Gaernarfon ... (Cardiff, 1928).