Columbia subject headings:
Bayreuther Festspiele.
Documentary films.
Opera--Production and direction--Germany--Bayreuth.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Harvard subject headings:
Bayreuther Festspiele.
Opera--Production and direction
Operas--Documentaries.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Princeton subject headings: