Historical memoirs of Anglesey
- NLW MS 822C
- Ffeil
- 1807
Rhan oTŷ Coch Manuscripts
'Historical Memoirs of the Ancient and present State of Mona ... by a Land Surveyor, [i.e. William Williams, Llandegai [1738-1817]], 1807', followed by an index of commotes and parishes named in the work.