An interleaved copy of W. Owen Pughe (ed. Robert John Pryse): A National Dictionary of the Welsh Language : with English and Welsh Equivalents, vol. II (Denbigh, 1873), with copious additions and emendations in the hand of Robert Roberts ('Y Sgolor Mawr'). There are a few insets in the hand of Daniel Silvan Evans.

An incomplete printed interleaved copy of William Owen-Pughe: 'A National Dictionary of the Welsh Language': Vol. II, with manuscript notes.

A printed interleaved copy of William Owen-Pughe: 'A National Dictionary of the Welsh Language': Vol. I, A-D., 3rd ed. (1866), with manuscript notes by D. Silvan Evans.

An imperfect interleaved copy of W. Owen Pughe, Geiriadur Cenhedlaethol Cymraeg a Saesneg. A National Dictionary of the Welsh Language [3rd ed., by Robert John Pryse, Denbigh, 1866], with copious annotations and additions, mainly in the hand of Robert Roberts ('Y Sgolor Mawr') and occasionally in the hand of D. Silvan Evans.

An incomplete holograph Welsh - English dictionary (A - Drydol, pp. 1-1156) by Robert Roberts ('Y Sgolor Mawr'; 1834-85).