Columbia subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Congresses.
Harvard subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Criticism and interpretation--Congresses.
Princeton subject headings:
Tolkien, J. R. R. (John Ronald Reuel), 1892-1973--Congresses.