Here is a link to a study that will interest and fascinate those of us interested in the mythopoesis as imagined by Coleridge, GMac, C.S. Lewis and Tolkien.
This is very good stuff.(a pdf file).
Let me know what you think if you get a chance.
https://diginole.lib.fsu.edu/islandora/object/fsu:181270/datastream/PDF/view