Columbia subject headings:
Wagner, Richard, 1813-1883--Performances.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Harvard subject headings:
Wagner, Richard, 1813-1883--Performances.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Princeton subject headings:
Wagner, Richard, 1813-1883--Performances.
Wagner, Richard, 1813-1883. Ring des Nibelungen.