- NLW MS 1243D.
- Ffeil
- 1760-[1824] / [John Roberts] and others.
Rhan oJohn Roberts MSS,
An account book, 1760-1763, of a brewer [? at Caernarfon] dealing mainly with Anglesey and Caernarvonshire customers; the volume was later used as an arithmetic and geometry exercise book, probably by Roberts.