Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Political activity.
Exile (Punishment) in literature.
Exiles in literature.
Exiles--Germany--History--20th century.
German literature--20th century--History and criticism
German literature--Foreign countries
German literature--Political aspects--20th century.
Princeton subject headings:
German literature--20th century--History and criticism.
German literature--Foreign countries.