Celts
Free to read here, from Project Gutenberg.
The Fairy-Faith in Celtic Countries
The Religion of the Ancient Celts
Myths & Legends of the Celtic Race
Celtic Scotland
Celtic Scotland
The Wild Irish Girl: A National Tale
Celtic Folklore: Welsh and Manx (Volume 1 of 2)
Celtic Folk and Fairy Tales
Celtic Scotland
The Mythology of the British Islands
More Celtic Fairy Tales
Celtic Folklore: Welsh and Manx (Volume 2 of 2)
Celtic Fairy Tales
The Age of Chivalry
The Bronze Age and the Celtic World
Keltische Mythen en Legenden
Fragments of Ancient Poetry
Beside the Fire: A collection of Irish Gaelic folk stories
The Laughter of Peterkin: A retelling of old tales of the Celtic Wonderworld
Lyra Celtica: An Anthology of Representative Celtic Poetry
Celtic religion in pre-Christian times