Columbia subject headings:
Harvard subject headings:
African American labor union members--History--Sources.
African Americans--Employment--History--Sources.
African Americans--Social conditions--To 1964--History--Sources.
Rural-urban migration--United States
Princeton subject headings:
African American labor union members--History--Sources.
African Americans--Employment--History--20th century--Sources.
African Americans--Social conditions--To 1964--Sources.
Rural-urban migration--United States--History--Sources.