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