Columbia subject headings:
Harvard subject headings:
Africa, Southern--Dependency on South Africa.
Africa, Southern--Foreign economic relations--South Africa.
Africa, Southern--Foreign relations--South Africa.
Railroads--Africa, Southern.
South Africa--Foreign economic relations--Africa, Southern.
South Africa--Foreign relations--Africa, Southern.
Princeton subject headings:
Africa, Southern--Foreign economic relations--South Africa.
Africa, Southern--Foreign relations--South Africa.
Africa, Southern--Strategic aspects.
South Africa--Foreign economic relations--Africa, Southern.
South Africa--Foreign relations--Africa, Southern.
South Africa--Strategic aspects.