Columbia subject headings:
Harvard subject headings:
African Americans--Economic conditions--Exhibitions.
African Americans--Social conditions--To 1964--Exhibitions.
Rural-urban migration--United States--Exhibitions.
United States--Social conditions--Exhibitions.
Princeton subject headings:
African Americans--Migrations--History--20th century--Exhibitions.
Migration, Internal--United States--History--20th century--Exhibitions.
Rural-urban migration--United States--History--20th century--Exhibitions.