Columbia subject headings:
Caesar, Julius--In literature.
History in opera.
Libretto.
Opera--Italy--18th century.
Opera--Italy--19th century.
Operas--Librettos.
Harvard subject headings:
Caesar, Julius--In literature.
History in opera
Libretto
Opera--Italy--18th century
Opera--Italy--19th century
Operas--Librettos
Princeton subject headings:
Caesar, Julius--In literature.
History in opera.
Libretto.
Opera--Italy--18th century.
Opera--Italy--19th century.
Operas--Librettos.