| Cyf | Casgliad | Statws Catalog Arlein |
| | | |
| AH | Anglesey Hunt Records and Artefacts | Ar gael arlein |
| AHC | Anglesey Hunting Club Records | Ar gael arlein |
| AM | Amlwch Mss | Ar gael arlein |
| AO | Alun Owen Papers | Ar gael arlein |
| ASH | Ashby (Ty Calch) Mss | Ar gael arlein |
| BALAB | Bala-Bangor Mss | Ar gael arlein |
| BA | Beaumaris and Anglesey Records | Ar gael arlein |
| BEL | Belmont Mss | Ar gael arlein |
| BHILL | Baron Hill Mss | Catalog papur yn unig |
| BMSS | Bangor Mss | Ar gael arlein |
| BOD | Bodorgan Mss | Canran ar gael arlein |
| BODR | Bodrhyddan Mss | Catalog papur yn unig |
| BRO | Broom Hall Mss | Ar gael arlein |
| BRYN | Brynaerau Mss | Ar gael arlein |
| CA | Caerau Mss | Ar gael arlein |
| CAS | Castell Mss | Ar gael arlein |
| CEFND | Cefndu Mss | Ar gael arlein |
| CEFN | Cefn Llan Mss | Ar gael arlein |
| COET | Coetmor Mss | Ar gael arlein |
| CORF | Corfanydd Mss | Catalog papur yn unig |
| CV | Carter Vincent Mss | Canran ar gael arlein |
| CRV | Crawley-Vincent Mss | Ar gael arlein |
| CYM | Cymru 2000 | Ar gael arlein |
| CYN | Cynhaiarn Mss | Ar gael arlein |
| CYNAN | Papurau Cynan | Ar gael arlein |
| DarbAdd | Darbishire Papers Additional | Ar gael arlein |
| DGJ | Archif Dafydd Glyn Jones | Ar gael arlein |
| DIN | Dinam Hall Mss | Ar gael arlein |
| ED | Edern Mss | Ar gael arlein |
| GAB | Gabriel Hughes Mss | Ar gael arlein |
| GAI | Gaianydd Mss | Ar gael arlein |
| GARTH | Garthewin Mss | Catalog papur yn unig |
| GARTHA | Garthewin Additional Mss | Ar gael arlein |
| GASQ | Gasquoine Mss | Ar gael arlein |
| GL | Papurau Gweneth Lilly | Ar gael arlein |
| GOP | Goppa Diaries | Ar gael arlein |
| GWAL | Gwalchmai Mss | Ar gael arlein |
| GWR | Gwredog Mss | Ar gael arlein |
| GWYN | Gwyneddon Mss | Catalog papur yn unig |
| HENA | Henblas A Mss | Ar gael arlein |
| HENB | Henblas B Mss | Ar gael arlein |
| HEN | Henllys Mss | Canran ar gael arlein |
| HUGH | Dr Hugh Jones Papers | Ar gael arlein |
| IW | Papurau Ifor Williams | Ar gael arlein |
| JMJ | Papurau John Morris-Jones | Ar gael arlein |
| JOR | J.O. Roberts Papers | Ar gael arlein |
| KIN | Kinmel Mss | Ar gael arlein |
| LLA | Lluniau Amrywiol / Misc. Photos | Ar gael arlein |
| LLE | Llwydiarth Esgob Mss | Ar gael arlein |
| LLECH | Llecheiddior Mss | Catalog papur yn unig |
| LLIG | Lligwy Mss | Canran ar gael arlein |
| LLM | Lluniau Mawr / Large photos | Ar gael arlein |
| LLOYD | J.E. Lloyd Mss | Ar gael arlein |
| LLYS | Llysdulas Mss | Ar gael arlein |
| MAEN | Maenan Mss | Ar gael arlein |
| MEUD | Meudwy Môn Mss | Ar gael arlein |
| MN | Maesyneuadd Mss | Ar gael arlein |
| MOR | Morfa Mss | Catalog papur yn unig |
| MON | Mona Mine Records | Catalog papur yn unig |
| MOST | Mostyn Mss | Canran ar gael arlein |
| NAN | Nannau Mss | Catalog papur yn unig |
| NANT | Nantlle Mss | Ar gael arlein |
| NEW | Newell Mss | Ar gael arlein |
| NIC | Nicander Mss | Ar gael arlein |
| NOR | Normal Records | Canran ar gael arlein |
| NWC | Nanney Williams Collection | Ar gael arlein |
| PAG | Paget Papers | Ar gael arlein |
| PAMP | Pamplin Papers | Ar gael arlein |
| PARC | Parciau Papers | Ar gael arlein |
| PEN | Penrhos Mss | Canran ar gael arlein |
| PENRH | Penrhyn Castle | Ar gael arlein |
| PENRA | Penrhyn Castle Additional Mss | Ar gael arlein |
| PFA | Penrhyn Castle Further Additional | Ar gael arlein |
| PBRA | Penrhyn BRA | Ar gael arlein |
| PQS | Penrhyn Quarry Strike | Ar gael arlein |
| PBIS | Penrhyn Correspondence | Ar gael arlein |
| PC | Plas Carreg Mss | Ar gael arlein |
| PCO | Plas Coch MSS | Canran ar gael arlein |
| PG | Plas Gwyn Mss | Ar gael arlein |
| PM | Pentre Mawr Mss | Ar gael arlein |
| PN | Plas Newydd Mss | Ar gael arlein |
| PYA | Porth yr Aur | Canran ar gael arlein |
| PYAA | Porth yr Aur Additional | Canran ar gael arlein |
| PRES | Presaddfed Mss | Catalog papur yn unig |
| RDG | R.D. Griffith Papers | Catalog papur yn unig |
| RHIW | Rhiwbach Mss | Ar gael arlein |
| RST | R.S.Thomas and Elsi Eldridge Papers | Ar gael arlein |
| RTJ | Papurau R. Tudur Jones | Ar gael arlein |
| RTP | R.T.Pritchard Papers | Ar gael arlein |
| SC | Sale Catalogues | Ar gael arlein |
| SEAR | Searell Papers | Ar gael arlein |
| SHANK | Shankland Mss | Ar gael arlein |
| STAP | Stapleton-Cotton Mss | Ar gael arlein |
| STM | St Mary’s Records | Ar gael arlein |
| TR | Papurau Tomos Roberts | Ar gael arlein |
| TRE | Tregayan and Aberdunant Mss | Ar gael arlein |
| TRALL | Trallwyn Mss | Ar gael arlein |
| TYN | Tynygongl Mss | Ar gael arlein |
| UCNW | Casgliad y Coleg / UCNW | Canran ar gael arlein |
| WCE | William Charles Evans Papers | Ar gael arlein |
| WHEL | Wheldon Papers | Ar gael arlein |
| WYNN | Wynn Hall Mss | Ar gael arlein |
| WHC | Whitney and Clifford Mss | Ar gael arlein |
| YALE | Yale Mss | Ar gael arlein |
