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