Columbia subject headings:
Operas--Congresses.
Operatic scenes--Congresses.
Schoeck, Othmar, 1886-1957. Schloss Dürande--Congresses.
Harvard subject headings:
Opera--Switzerland--Congresses.
Schoeck, Othmar, 1886-1957--Criticism and interpretation--Congresses.
Schoeck, Othmar, 1886-1957. Schloss Dürande--Congresses.
Princeton subject headings:
Operas--Congresses.
Operatic scenes--Congresses.
Schoeck, Othmar, 1886-1957. Schloss Dürande--Congresses.