Columbia subject headings:
Harvard subject headings:
Opera--Production and direction--Italy--Milan--History--19th century.
Opera--Production and direction--Italy--Rome--History--19th century.
Operas--Stage guides
Verdi, Giuseppe, 1813-1901--Performances.
Verdi, Giuseppe, 1813-1901. Ballo in maschera
Princeton subject headings:
Opera--Production and direction--Italy--Milan--History--19th century.
Opera--Production and direction--Italy--Rome--History--19th century.
Operas--Stage guides.
Verdi, Giuseppe, 1813-1901. Ballo in maschera.