Columbia subject headings:
American literature--20th century--History and criticism.
Authors, American--Congresses.
Proletariat.
Social problems in literature.
Harvard subject headings:
American literature--20th century--History and criticism
American literature--20th century--History and criticism--Congresses
Authors, American--20th century--Biography--Congresses.
Authors, American--Congresses.
Proletariat.
Social problems in literature.
Princeton subject headings:
American literature--20th century--History and criticism.
Authors, American--Congresses.
Proletariat.
Social problems in literature.