- NLW MS 5247C
- [20 cent.]
A photostat facsimile of the old Welsh music transcribed by Robert ap Huw of Bodwigan, Anglesey, from the original by William Penllyn and contained in British Museum Add. MS. 14905.
Wiliam Penllyn, fl. 1550-1570 Old welsh music from original of, facsimile, NLW MS 5247C