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