Columbia subject headings:
Harvard subject headings:
German drama--19th century--History and criticism
German drama--20th century--History and criticism
German drama--21st century--History and criticism.
Theater--Germany--History--19th century
Theater--Germany--History--20th century
Theater--Germany--History--21st century.
Princeton subject headings:
German drama--19th century--History and criticism.
German drama--20th century--History and criticism.
German drama--21st century--History and criticism.
Theater--Germany--History--19th century.
Theater--Germany--History--20th century.
Theater--Germany--History--21st century.