Columbia subject headings:
Africa, West--Foreign relations--Great Britain.
Africa, West--Foreign relations--United States.
Great Britain--Foreign relations--Africa, West.
Oil fields--Africa, West.
United States--Foreign relations--Africa, West.
Harvard subject headings:
Africa, West--Foreign relations--Great Britain.
Africa, West--Foreign relations--United States.
Great Britain--Foreign relations--Africa, West.
Oil fields--Africa, West.
United States--Foreign relations--Africa, West.
Princeton subject headings:
Africa, West--Foreign relations--Great Britain.
Africa, West--Foreign relations--United States.
Great Britain--Foreign relations--Africa, West.
Oil fields--Africa, West.
United States--Foreign relations--Africa, West.