Columbia subject headings:
Harvard subject headings:
Theater--England--Yorkshire--History--20th century.
Theater--Germany--Westphalia--History--20th century.
Princeton subject headings:
Theater--England--Yorkshire--History--20th century.
Theater--Germany--Westphalia--History--20th century.
Westphalia (Germany)--History--20th century.
Yorkshire (England)--History--20th century.