Columbia subject headings:
Copper miners--Zambia--History--20th century.
Industrial relations--Zambia--History--20th century.
Skilled labor--Zambia--History--20th century.
Harvard subject headings:
Princeton subject headings:
Copper miners--Zambia--History--20th century.
Industrial relations--Zambia--History--20th century.
Skilled labor--Zambia--History--20th century.