Columbia subject headings:
Opera--Production and direction--England--History.
Royal Opera House (London, England)
Wagner, Richard, 1813-1883--Performances--England--London--History.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Harvard subject headings:
Opera--Production and direction--England--History.
Royal Opera House (London, England)
Wagner, Richard, 1813-1883--Performances--England--London.
Wagner, Richard, 1813-1883. Ring des Nibelungen.
Princeton subject headings: