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