Columbia subject headings:
Nibelungen in literature--Congresses.
Nibelungenlied--Influence--Congresses.
Harvard subject headings:
Epic poetry, German--History and criticism--Congresses.
German poetry--Middle High German, 1050-1500--History and criticism--Congresses.
Nibelungenlied--Congresses.
Princeton subject headings:
Nibelungen in literature--Congresses.