Columbia subject headings:
Africa--Relations--United States--Congresses.
African Americans--Bibliography.
American literature--20th century--History and criticism--Congresses.
United States--Civilization--Congresses.
United States--Relations--Africa--Congresses.
Harvard subject headings:
Africa--Relations--United States--Congresses.
African Americans--Bibliography
American literature--20th century--History and criticism--Congresses
United States--Civilization--Congresses.
United States--Relations--Africa--Congresses.
Princeton subject headings: