Columbia subject headings:
Carnival--Austria--Vienna--History--18th century.
Opera--Austria--Vienna--History--18th century.
Harvard subject headings:
Carnival--Austria--Vienna--History--18th century.
Charles VI, Holy Roman Emperor, 1685-1740.
Opera--Austria--Vienna--History--18th century.
Vienna (Austria)--Social life and customs--18th century.
Princeton subject headings:
Carnival--Austria--Vienna--History--18th century.
Opera--Austria--Vienna--History--18th century.