Columbia subject headings:
Opera--Italy--17th century.
Opera--Italy--18th century.
Prisons--Drama--History and criticism.
Harvard subject headings:
Opera--Italy--17th century.
Opera--Italy--18th century
Prisons--Drama--History and criticism.
Princeton subject headings:
Opera--Italy--17th century.
Opera--Italy--18th century.
Prisons--Drama--History and criticism.