Columbia subject headings:
Free verse.
German poetry--20th century--History and criticism.
Poetry, Modern--20th century--History and criticism.
Harvard subject headings:
Free verse.
German poetry--20th century--History and criticism
Poetry, Modern--20th century--History and criticism
Princeton subject headings:
Free verse.
German poetry--20th century--History and criticism.
Poetry, Modern--20th century--History and criticism.