Columbia subject headings:
African Americans--Economic conditions.
African Americans--Employment--History--20th century.
African Americans--Segregation.
Cities and towns--United States--History--20th century.
United States--Economic conditions.
United States--Race relations.
Harvard subject headings:
African Americans--Economic conditions
African Americans--Employment--History--20th century.
African Americans--Segregation
Cities and towns--United States--History--20th century.
United States--Economic conditions.
United States--Race relations
Princeton subject headings:
African Americans--Economic conditions.
African Americans--Employment--History--20th century.
African Americans--Segregation.
Cities and towns--United States--History--20th century.
United States--Economic conditions.
United States--Race relations.