Columbia subject headings:
German literature--18th century.
German literature--19th century.
German literature--20th century.
Harvard subject headings:
German literature--18th century
German literature--18th century--History and criticism
German literature--19th century
German literature--19th century--History and criticism
German literature--20th century
German literature--20th century--History and criticism
Princeton subject headings:
German literature--18th century.
German literature--19th century.
German literature--20th century.