Columbia subject headings:
Harvard subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation.
Princeton subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Allegory and symbolism.
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Knowledge--Folklore, mythology.