Columbia subject headings:
Expressionism--Germany.
German philology--History--20th century.
German poetry--20th century--History and criticism.
Poetics.
Harvard subject headings:
Expressionism in literature.
German literature--20th century--History and criticism
German philology--History--20th century.
German poetry--20th century--History and criticism
Poetics
Princeton subject headings:
Expressionism--Germany.
German philology--History--20th century.
German poetry--20th century--History and criticism.
Poetics.