Columbia subject headings:
Meyerbeer, Giacomo, 1791-1864--Congresses.
Harvard subject headings:
Meyerbeer, Giacomo, 1791-1864--Congresses.
Opera--Europe--19th century--Congresses.
Princeton subject headings:
Meyerbeer, Giacomo, 1791-1864. Operas--Congresses.
Opera--Europe--19th century--Congresses.