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| Ref | Collection | Online Catalogue Status |
| | | |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| A | | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Partly available online |
| | Available online |
| | Partly available online |
| BODR | Bodrhyddan Mss | Paper catalogue only |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| CORF | Corfanydd Mss | Paper catalogue only |
| | Partly available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| D | | Available online |
| | Available online |
| GAB | Gabriel Hughes Mss | Available online |
| | Available online |
| GARTH | Garthewin Mss | Paper catalogue only |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| GWYN | Gwyneddon Mss | Paper catalogue only |
| | Available online |
| | Available online |
| | Partly available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| LLECH | Llecheiddior Mss | Paper catalogue only |
| | Partly available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| MOR | Morfa Mss | Paper catalogue only |
| MON | Mona Mine Records | Paper catalogue only |
| | Partly available online |
| NAN | Nannau Mss | Paper catalogue only |
| | Available online |
| | Available online |
| | Available online |
| | Partly available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Partly available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Partly available online |
| | Available online |
| | Available online |
| | Available online |
| | Partly available online |
| | Partly available online |
| PRES | Presaddfed Mss | Paper catalogue only |
| RDG | R.D. Griffith Papers | Paper catalogue only |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Available online |
| | Partly available online |
| | Available online |
| | Available online |
| YNN | | Available online |
| | Available online |
| | Available online |
