Columbia subject headings:
Arts--Switzerland--Zurich.
Opernhaus Zürich.
Theater--Switzerland--Zurich--History.
Theaters--Switzerland--Zurich.
Zurich (Switzerland)--Buildings, structures, etc.
Harvard subject headings:
Arts--Switzerland--Zurich.
Opernhaus Zürich.
Theater--Switzerland--Zurich--History.
Theaters--Switzerland--Zurich.
Zurich (Switzerland)--Buildings, structures, etc.
Princeton subject headings:
Opera--Switzerland--Zurich--History.
Opernhaus Zürich--History.
Theaters--Switzerland--Construction--History.