Columbia subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation.
Harvard subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation--Congresses.
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973. Lord of the rings--Congresses.
Princeton subject headings:
Fantasy fiction, English--History and criticism--Congresses.
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation--Congresses.