Columbia subject headings:
Opera--France--Paris--19th century--Congresses.
Paris (France)--Intellectual life--Congresses.
Wagner, Richard, 1813-1883--Homes and haunts--France--Paris--Congresses.
Harvard subject headings:
Opera--France--Paris--19th century--Congresses.
Paris (France)--Intellectual life--Congresses.
Wagner, Richard, 1813-1883--Homes and haunts--France--Paris--Congresses.
Princeton subject headings: