Columbia subject headings:
Birmingham (England)--Economic conditions.
Industries--England--Birmingham--History.
Labor supply--England--Birmingham--History.
Harvard subject headings:
Birmingham (England)--Economic conditions.
Industries--England--Birmingham--History.
Labor supply--England--Birmingham--History.
Princeton subject headings:
Birmingham (England)--Economic conditions.
Industries--England--Birmingham--History.
Labor supply--England--Birmingham--History.