Columbia subject headings:
Halévy, F., 1799-1862--Congresses.
Opera--France--19th century--Congresses.
Harvard subject headings:
Halévy, F., 1799-1862--Congresses.
Opera--France--19th century--Congresses.
Princeton subject headings:
Halévy, F., 1799-1862--Congresses.
Opera--France--19th century--Congresses.