Columbia subject headings:
Naples (Italy)--Civilization--18th century.
Opera--Italy--Naples--18th century--History and criticism.
Opera--Italy--Naples--19th century--History and criticism.
Harvard subject headings:
Naples (Italy)--Civilization--18th century.
Naples (Italy)--Civilization--19th century.
Opera--Italy--Naples--18th century.
Opera--Italy--Naples--19th century.
Princeton subject headings:
Naples (Italy)--Civilization--18th century.
Naples (Italy)--Civilization--19th century.
Opera--Italy--Naples--18th century--History and criticism.
Opera--Italy--Naples--19th century--History and criticism.