Columbia subject headings:
Eisler, Hanns, 1898-1962--Congresses.
Eisler, Hanns, 1898-1962. Johann Faustus.
Opera--20th century--Congresses.
Harvard subject headings:
Eisler, Hanns, 1898-1962--Criticism and interpretation--Congresses.
Eisler, Hanns, 1898-1962. Johann Faustus--Congresses.
Princeton subject headings:
Eisler, Hanns, 1898-1962. Johann Faustus.