Columbia subject headings:
Harvard subject headings:
Opera--Austria--Salzburg--20th century.
Opera--Austria--Salzburg.
Opera--Production and direction--Austria--Salzburg.
Operas--Performances--Austria--Salzburg.
Salzburger Festspiele.
Princeton subject headings:
Opera--Austria--Salzburg.
Opera--Production and direction--Austria--Salzburg.
Operas--Performances--Austria--Salzburg.
Salzburger Festspiele.