Today's free book is The Swallow Book by Giuseppe Pitrè (1912), translated by Ada Walker Camehl. For the table of contents, check at the bottom of this post below the image.
The book is available at Hathi Trust (I have not checked for other online sources).
Table of Contents
The Swallow
The Swallow in Legend and Fable
The Swallow in Legend and History
The Swallow in Beliefs and Omens
The Swallow in Proverbs and Riddles
The Swallow in Folk Songs
The Swallow in Medicine
Our Debt to the Swallows