Columbia subject headings:
Portugal--Foreign relations--1933-1974--Sources.
World War, 1939-1945--Portugal--Sources.
Harvard subject headings:
Portugal--Foreign relations--1933-1974--Sources.
Portugal--Foreign relations--Sources.
World War, 1939-1945--Portugal--Sources.
World War, 1939-1945--Portugal.
Princeton subject headings:
Portugal--Foreign relations--Sources.
World War, 1939-1945--Portugal.