Columbia subject headings:
African Americans--Economic conditions--Bibliography--Catalogs.
African Americans--Employment--Sources--Bibliography--Catalogs.
United States. Department of Labor--Archives--Catalogs.
United States. National Archives and Records Service--Catalogs.
Harvard subject headings:
African Americans--Economic conditions--Sources--Bibliography--Catalogs.
African Americans--Employment--Sources--Bibliography--Catalogs.
United States. Department of Labor--Archives--Catalogs.
Princeton subject headings: