Columbia subject headings:
Iron and steel workers--Labor unions--Great Britain--History.
Iron industry and trade--Great Britain--History.
Steel industry and trade--Great Britain--History.
Harvard subject headings:
Iron and steel workers--Labor unions--Great Britain--History.
Iron industry and trade--Great Britain--History
Steel industry and trade--Great Britain--History
Princeton subject headings:
Iron and steel workers--Labor unions--Great Britain--History.
Iron industry and trade--Great Britain--History.
Steel industry and trade--Great Britain--History.