Marie-Louise von Franz wrote many books on the interpretation of fairy tales. Probably easiest to check your local libraries, Amazon, or ABEbooks to see what you can find. She was a long time associate of Carl Jung, so definitely not Freudian. Some of her work can be somewhat difficult, but not nearly as difficult as those of Jung's works intended for his psychoanalytic peers.
At a guess, Tolkien's book might be from a literature viewpoint, while von Franz is definitely psychoanalytic.
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