Columbia subject headings:
Neutrality--Spain.
Spain--Foreign relations--1939-1975.
Spain--Politics and government--1939-1975.
World War, 1939-1945--Spain.
Harvard subject headings:
Neutrality--Spain--History--20th century.
Spain--Foreign relations--1939-1975.
Spain--Politics and government--1939-1945.
World War, 1939-1945--Spain.
Princeton subject headings:
Neutrality--Spain.
Spain--Foreign relations--1939-1975.
World War, 1939-1945--Spain.