Columbia subject headings:
Spain--Foreign relations--1939-1975.
Spain--Foreign relations--1975-
Spain--Foreign relations--United States.
United States--Foreign relations--1945-1989.
United States--Foreign relations--Spain.
Harvard subject headings:
Spain--Foreign relations--1939-1975.
Spain--Foreign relations--1975-
Spain--Foreign relations--United States.
United States--Foreign relations--1945-
United States--Foreign relations--Spain.
Princeton subject headings:
Spain--Foreign relations--1939-1975.
Spain--Foreign relations--1975-
Spain--Foreign relations--United States.
United States--Foreign relations--1945-1989.
United States--Foreign relations--Spain.