Columbia subject headings:
Great Britain--Colonies--Africa--Economic policy.
Railroads--Freight--Rates--Zambia--History.
Tariff preferences--Zambia--History.
Zambia--Economic policy.
Harvard subject headings:
Great Britain--Colonies--Africa--Economic policy.
Railroads--Freight--Rates--Zambia--History.
Tariff preferences--Zambia--History.
Zambia--Economic policy.
Princeton subject headings:
Great Britain--Colonies--Africa--Economic policy.
Railroads--Zambia--Rates--History.
Tariff preferences--Zambia--History.
Zambia--Economic policy.