Columbia subject headings:
Art.
Ibsen, Henrik, 1828-1906.
Nordau, Max Simon, 1849-1923. Entartung.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Harvard subject headings:
Art
Ibsen, Henrik, 1828-1906
Nordau, Max Simon, 1849-1923. Entartung.
Wagner, Richard, 1813-1883. Ring des Nibelungen
Princeton subject headings: