Columbia subject headings:
Theater--Production and direction--History--20th century.
Theaters--Stage-setting and scenery--History--20th century.
Harvard subject headings:
Theater--Production and direction--History--20th century.
Theaters--Stage-setting and scenery--History--20th century.
Princeton subject headings:
Theater--Production and direction--History--20th century.
Theaters--Stage-setting and scenery--History--20th century.