Columbia subject headings:
Baroque literature--History and criticism.
Italian poetry--History and criticism.
Librettos--17th century.
Librettos--18th century.
Harvard subject headings:
Baroque literature--History and criticism.
Italian poetry--History and criticism
Libretto.
Opera--17th century.
Opera--18th century
Opera--Italy
Operas--Librettos--History and criticism.
Princeton subject headings: