Columbia subject headings:
Harvard subject headings:
Opera--Russia (Federation)--Saint Petersburg.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Princeton subject headings:
Opera--Russia (Federation)--Saint Petersburg.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Wagner, Richard, 1813-1883. Ring des Nibelungen.