Columbia subject headings:
Harvard subject headings:
Portugal--Foreign relations--Spain
Portugal--Politics and government--1926-1933
Salazar, António de Oliveira, 1889-1970
Spain--Foreign relations--Portugal
Spain--History--Civil War, 1936-1939
Princeton subject headings:
Portugal--Foreign relations--Spain.
Portugal--Politics and government--1926-1933.
Salazar, António de Oliveira, 1889-1970.
Spain--Foreign relations--Portugal.
Spain--History--Civil War, 1936-1939.