- Lexicon Cornu-Britannicum: A Dictionary of the Ancient Celtic Language of Cornwall, in Which the Words Are Elucidated by Copious Examples from th
- Eminent Welshmen: a short biographical dictionary of Welshmen who have attained distinction from the earliest times to the present
- The History of Charlemagne. the Translation of Ystorya de Carolo Magno, with a Historical and Critical Introduction
- The History and Antiquities of the Town of Aberconwy and It Neighbourhood: With Notices of the Natural History of the District
- Enwogion Cymru. A Biographical Dictionary of Eminent Welshmen, From the Earliest Times to the Presen