Columbia subject headings:
Massenet, Jules, 1842-1912--Congresses.
Opera--France--Congresses.
Opéra comique--Congresses.
Opéra-Comique (Paris, France)--Congresses.
Harvard subject headings:
Massenet, Jules, 1842-1912.
Opera--France--Paris--19th century
Opéra-Comique (Paris, France)
Princeton subject headings:
Massenet, Jules, 1842-1912--Congresses.
Opera--France--Congresses.
Opéra comique--Congresses.
Opéra-Comique (Paris, France)--Congresses.