Columbia subject headings:
American poetry--20th century--History and criticism.
Literature and society--United States--History--20th century.
Social problems in literature.
Harvard subject headings:
American poetry--20th century--History and criticism
Literature and society--United States--History--20th century.
Social problems in literature.
Princeton subject headings:
American poetry--20th century--History and criticism.
Literature and society--United States--History--20th century.
Social problems in literature.