Columbia subject headings:
Authors, German--20th century--Biography--Dictionaries.
German literature--20th century--History and criticism.
German literature--20th century.
German literature--Germany--North Rhine-Westphalia--History and criticism.
German literature--Germany--North Rhine-Westphalia.
Harvard subject headings:
Authors, German--20th century--Biography--Dictionaries
German literature--20th century
German literature--20th century--History and criticism
German literature--Germany--North Rhine-Westphalia--History and criticism.
German literature--Germany--North Rhine-Westphalia.
Princeton subject headings:
Authors, German--Germany--North Rhine-Westphalia--Bio-bibliography.
German literature--20th century--Bio-bibliography.