5 books
Dictionary of the Welsh Language
Dictionary of the Welsh Language Volume 2, Pts. 3-4
Gwaith y Parch. Walter Davies (Gwallter Mechain) (Volume 3)
Blodau Ieuaine
The Literature of the Kymry; Being a Critical Essay on the History of the Language and Literature of Wales During the Twelfth and Two Succeeding Centuries, Containing Numerous Specimens of Ancient Welsh Poetry in the Original and Accompanied with English