Columbia subject headings:
Harvard subject headings:
Denmark--History--German occupation, 1940-1945.
Norway--History--German occupation, 1940-1945.
World War, 1939-1945--Campaigns--Denmark.
World War, 1939-1945--Campaigns--Norway.
Princeton subject headings:
Denmark--History--German occupation, 1940-1945.
Norway--History--German occupation, 1940-1945.
World War, 1939-1945--Campaigns--Denmark.
World War, 1939-1945--Campaigns--Norway.