Columbia subject headings:
Black people--South Africa--Economic conditions.
Foundry workers--South Africa.
Labor unions, Black--South Africa.
Labor unions--South Africa.
South Africa--Race relations.
Working class--South Africa.
Harvard subject headings:
Foundry workers--Labor unions--South Africa--History.
Foundry workers--South Africa--History.
Labor unions, Black--South Africa--History.
Labor unions--South Africa--History.
Princeton subject headings:
Foundry workers--Labor unions--South Africa--History.
Foundry workers--South Africa--History.
Labor unions, Black--South Africa--History.
Labor unions--South Africa--History.