Columbia subject headings:
Harvard subject headings:
Opernhaus Zürich--History.
Theater--Switzerland--Zurich--Finance.
Theater--Switzerland--Zurich--History.
Theaters--Switzerland--Zurich--Finance.
Theaters--Switzerland--Zurich--History.
Princeton subject headings:
Opernhaus Zürich--History.
Theater--Switzerland--Zurich--Finance.
Theater--Switzerland--Zurich--History.
Theaters--Switzerland--Zurich--Finance.
Theaters--Switzerland--Zurich--History.