Columbia subject headings:
German literature--19th century--History and criticism.
German literature--20th century--History and criticism.
Socialism in literature.
Working class in literature.
Harvard subject headings:
German literature--19th century--History and criticism
German literature--20th century--History and criticism
Working class authors.
Working class in literature.
Princeton subject headings:
German literature--19th century--History and criticism.
German literature--20th century--History and criticism.
Working class authors.
Working class in literature.