Columbia subject headings:
American literature--20th century--History and criticism.
Canadian literature--20th century--History and criticism.
Social problems in literature.
Harvard subject headings:
American literature--20th century--History and criticism
Canadian literature--20th century--History and criticism
Social problems in literature.
Princeton subject headings:
American literature--20th century--History and criticism.
Canadian literature--20th century--History and criticism.
Social problems in literature.