Columbia subject headings:
Portugal--History--Occupation, 1939-1945.
World War, 1939-1945--Portugal.
World War, 1939-1945--Propaganda.
World War, 1939-1945--Underground movements--Portugal.
Harvard subject headings:
Portugal--History--1910-1974.
World War, 1939-1945--Portugal.
World War, 1939-1945--Propaganda.
World War, 1939-1945--Underground movements--Portugal.
Princeton subject headings:
Portugal--History--Occupation, 1939-1945.
World War, 1939-1945--Portugal.
World War, 1939-1945--Propaganda.
World War, 1939-1945--Underground movements--Portugal.