Today's free book is Celtic fables, fairy tales and legends, chiefly from ancient Welsh originals by Jane Williams (1862). For the table of contents, check at the bottom of this post below the image.
The book is available at Hathi (I have not checked for other online sources).
Table of Contents
The Ancients of the World
Wood Pigeon and Magpie
Mole and Lark
Two Fishes
Grasshopper and Ant
Elidwr
A Funeral Among the Small People
A Legend of Llynsafaddan