26 books
The Outlines of the Phonology of Manx Gaelic
The Text of the Bruts from the Red Book of Hergest Volume 2
The Celtic Inscriptions of France and Italy
Celtic Folklore Volume 2; Welsh and Manx
The Welsh People
Lectures on Welsh Philology
Celtae and Galli
Lectures on the Origin and Growth of Religion as by Celtic Heathendom
Celtic Folklore (Volume 1); Welsh and Manx
Celtic Britain (Volume 1)
The Welsh People; Chapters on Their Origin, History, Laws, Language, Literature, and Characteristics
A Revised Account of the Inscriptions of the Northern Picts
Teithiau Yn Nghymru Ref Cyfieithiad O'r Tours in Wales Ynghyda Chyfieithiad O'r Nodiadau A'r Rhagymadrodd Yn Yr Argraffiad Seisoneg Diweddaf. Gan John Rhys Hefyd Nodiadau Hanes Bywyd Yr Awdwr a Rhagarweiniad I Hanes y Llwythau Gan W. Trevor Parkins.
Studies in the Arthurian Legend
The Text of the Mabinogion and Other Welsh Tales from the Red Book of Hergest
Celtic Britain
Lectures on the Origin and Growth of Religion as Illustrated by Celtic Heathendom
Celtic Folklore, Welsh and Manx Volume 2
The Englyn. the Origin of the Welsh Englyn and Kindred Metres
Celtic Folklore; Welsh and Manx Volume 1
The Celtic Inscriptions of Cisalpine Gaul
The Celtic Inscriptions of Gaul, Additions and Corrections
The Celtic Inscriptions of Gaul (Volume 5); Additions and Corrections
Y Llyvyr Coch O Hergest