Columbia subject headings:
American poetry--20th century--History and criticism.
English poetry--20th century--History and criticism.
History in literature.
Harvard subject headings:
American poetry--20th century--History and criticism
English poetry--20th century--History and criticism
History in literature.
Princeton subject headings:
American poetry--20th century--History and criticism.
English poetry--20th century--History and criticism.
English poetry--Welsh authors--History and criticism.