Columbia subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation.
Harvard subject headings:
Fantasy literature, English--History and criticism.
Middle Earth (Imaginary place)
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation.
Princeton subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation.