- NLW MS 821C
- Ffeil
- 1806
Rhan oTŷ Coch Manuscripts
'A Survey of the Ancient and Present State of the County of Caernarvon by a Land surveyor [i.e. William Williams, Llandegai (1738-1817)], 1806', together with a list of the sheriffs of Caernarvonshire, 1540-1796.