| XD/28 | Solomon Andrews Papers |
| XB/9 | Bangor Borough Council Records |
| XES/5 | Brynrefail School |
| XM/543 | Bryntirion DeedsA catalogue of the Bryntirion (pa.[rish] Bangor) estate deeds, 1769-1855, which estate included properties in the parishes of Beddgelert, Llanddeiniolen, Llandwrog, Llanfairisgaer, Llanfihangel Ysceifiog, Llanfor, Llanllyfni and Llanycil, and the towns of Caernarfon and Dolgellau |
| XM/6243 | Papers of Thomas Bugbird & Son Ltd., Civil Engineering Contractors |
| XD/1 | Records and papers of the Borough of Caernarfon |
| XM/2070 | Records from the Caernarfon Liberal Club |
| XD/34 | Caernarfon Wesleyan Circuit RecordsA collection of records relating to the affairs of the Caernarfon Wesleyan Circuit before it joined with the Bangor and Tregarth Circuits to form the Arfon Circuit in September 1974. Also a few papers relating to the Arfon and Llanberis Circuits (for a short period c.1872-1880 Llanberis was a separate circuit). Deposited by the Rev. A.W. Francis, Circuit Superintendent. |
| XM/6665 | Capel Brynrhos (M.C.), Y Groeslon |
| XD/49 | Capel Coch Papers |
| XD/9 | Capel Moriah Records |
| XM/6513 | Capel M.C. Waunfawr |
| XD/32 | Cefnamwlch Estate Papers |
| XD/5 | Coed Helen Papers |
| XD/70 | Ellis Davies Papers |
| X/DOROTHEA | Dorothea Quarry Records |
| XM/479 | Constable Ellis DeedsA Collection of Deeds relating to the Parishes of Llanaelhaiarn (Llanaelhaearn), Llanwnda and Clynnog. |
| XES/5 | Friars' School: Papers Relating to the Administration and Estate Lands of Friars' School, Bangor |
| XQR/GK | Gamekeepers' Deputations |
| XM/8020 | Papers of Llewelyn T. Griffith |
| XM/6774 | Papers of Captain John Hughes, Brigydon, East Twthill, Caernarfon |
| XM/5564 | Papers of the Late G.O. JonesMr. G.O. Jones, Borthwen, Ael-y-Garth, Caernarfon, was the former headmaster of Caernarfon Free School and the first headmaster of Maesincla Junior School, Caernarfon. |
| XM/5976 | Papers of Llewelyn Lloyd Jones, Architect and Surveyor, Lloyds Bank Chambers, Caernarfon |
| XM/3630 | Papers of William Vaughan Jones, Dramatist and Local Historian, Waunfawr, Caernarfon. |
| XLTD | Inland Revenue Land Tax Assessment Records[These records are subject to a 30 year rule] |
| XM/1047 | Lewis Papers, Porthmadog |
| XM/4370 | Correspondence of the Morris Family |
| XD/25 | Motor Taxation RecordsA list of Vehicle Registration Records received from the Motor Taxation Department of Gwynedd County Council |
| XM/2642 | Papers of the North Wales Coast Football Association |
| XM/1669/2 | North Wales Football Association |
| XNWQU | Records of the North Wales Quarrymen's Union |
| XPE | Parish RecordsRecords emanating from parish churches, including registers and documents dealing with charities, roads, education and similar matters. |
| XPQ | Penrhyn Quarry |
| XM/1573 | People's Cafe: Papers of the Thomas family, People's Cafe, Caernarfon. |
| XM/923 | Plas Brereton PapersPapers from Plas Brereton, Caernarfon, deposited by permission of the executors of G.R. Rees, Esq. |
| XPOOLE | The Records of the Poole Solicitors |
| XQS | Caernarfonshire Quarter Sessions |
| XQAL | Quarter Sessions Licencing Records |
| XD/88/1 | Trevor Roberts Solicitors: Plastirion Estate PapersThe Plastirion Estate Papers form a sub-group to the Trevor Roberts Solicitors collection. As the catalogue shows, the bulk of the estate papers, including deeds, settlements and correspondence, have been dealt with chronologically (XD88/1/1-41) and are followed by the accounts (XD88/1/42-67).The estate embraced the parishes of Llanrug, Llanwnda and Llandwrog, near Caernarfon. It was under the ownership of the Rowlands family throughout the period covered, and the majority of the archive concerns Gen. Sir Hugh Rowlands (1827-1909). He was the second son of John Rowlands and the last male descendant to inherit the estate and reside in the Plastirion mansion in Llanrug before its break up in 1918. |
| XM/3626 | Papers of Captain Edward Williams, Ty Gwyn, Talsarnau |
| XM/7891 | Papers of Mansel Williams, Director of Education for Caernarfon |
