Columbia subject headings:
Harvard subject headings:
Africa, Southern--Foreign relations--1975-
Africa, Southern--Foreign relations--United States.
United States--Foreign relations--1977-1981.
United States--Foreign relations--1981-1989.
United States--Foreign relations--1989-
United States--Foreign relations--Africa, Southern.
Princeton subject headings:
Africa, Southern--Foreign relations--1975-1994.
Africa, Southern--Foreign relations--United States.
United States--Foreign relations--1977-1981.
United States--Foreign relations--1981-.
United States--Foreign relations--Africa, Southern.