Columbia subject headings:
United States--Foreign relations--1945-1989.
United States--Foreign relations--Executive agreements.
United States--Foreign relations--Treaties.
Harvard subject headings:
United States--Foreign relations--1945-
United States--Foreign relations--1945-1989.
United States--Foreign relations--Executive agreements.
United States--Foreign relations--Treaties.
Princeton subject headings:
Treaties.
United States--Foreign relations--1945-1989.
United States--Foreign relations--Executive agreements.
United States--Foreign relations--Treaties.