[Books which Mr Spence refers to that are already available at PG are:
Creation Myths of Primitive America by Jeremiah Curtin — http://www.gutenberg.org/ebooks/39106
Folklore as an Historical Science by G. Laurence Gomme — http://www.gutenberg.org/ebooks/21852
The Evolution of the Dragon by George Elliot Smith — http://www.gutenberg.org/ebooks/22038 — mdh]