Columbia subject headings:
Industries--South Africa--History.
Labor unions--South Africa--History.
South African Trades and Labour Council--History.
Harvard subject headings:
Industries--South Africa--History.
Labor unions--South Africa--History.
South African Trades and Labour Council--History.
Princeton subject headings:
Industries--South Africa--History.
Labor unions--South Africa--History.
South African Trades and Labour Council--History.