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.

Notebook, 1842-1853, of Thomas Williams, Felin-fach, Pumsaint, afterwards of Talley, co. Carmarthen, surveyor, and schoolmaster at Cwmdwr (Llanwrda), and Gwynfe, containing memoranda relating to rates, etc. in the parish of Talley; mathematical exercises; accounts, with names of pupils, relating to schools at ?Salem (Llandeilo) and Llan-crwys (inverted text ff. 72, 75 verso-6); and miscellaneous notes.